Articles de revues : « Bimetallo »

1

Peberdy, Jemma C., Jaroslav Malina, Syma Khalid, Michael J. Hannon et Alison Rodger. « Influence of surface shape on DNA binding of bimetallo helicates ». Journal of Inorganic Biochemistry 101, n^o 11-12 (novembre 2007) : 1937–45. http://dx.doi.org/10.1016/j.jinorgbio.2007.07.005.

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Cui, Weihong, X. Peter Zhang et Bradford B. Wayland. « Bimetallo-Radical Carbon−Hydrogen Bond Activation of Methanol and Methane ». Journal of the American Chemical Society 125, n^o 17 (avril 2003) : 4994–95. http://dx.doi.org/10.1021/ja034494m.

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Hu, Chih-Wei, Takashi Sato, Jian Zhang, Satoshi Moriyama et Masayoshi Higuchi. « Multi-colour electrochromic properties of Fe/Ru-based bimetallo-supramolecular polymers ». Journal of Materials Chemistry C 1, n^o 21 (2013) : 3408. http://dx.doi.org/10.1039/c3tc30440j.

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Ablyaz, Timur Rizovich, Evgeny Sergeevich Shlykov, Karim Ravilevich Muratov et Alexander Valentinovich Zhurin. « Study of the EDM Process of Bimetallic Materials Using a Composite Electrode Tool ». Materials 15, n^o 3 (19 janvier 2022) : 750. http://dx.doi.org/10.3390/ma15030750.

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New types of profile products make complex use of bimetals. These materials possess a set of properties such as strength, corrosion resistance, thermal conductivity, heat resistance, wear resistance. For the processing of such products, it is advisable to use electrophysical processing methods, one of which is the technology of copy-piercing electrical discharge machining (EDM). Currently, EDM is one of the most common methods for processing products from modern bimetal materials. An urgent task is to study the EDM process of bimetallic materials. The aim of the work was to increase the efficiency and accuracy of the EDM process of bimetallic products using electrode-tools with different physical and mechanical properties. Bimetal—weld coated steel backing, base material—09G2S steel, surfacing material—M1 copper were used. The processing of the bimetallic workpiece was carried out on an Electronica Smart CNC copy-piercing EDM machine. EI used graphite, copper, and composite. A theoretical model was developed that allows calculation of the amount of removal of bimetallic material of steel–copper depending on the EDM modes and the ET (electrode tool) material. During the processing of the steel layer, regardless of the EI material, microcracks were formed along the grain boundaries, and during the processing of the copper layer, enlarged holes resulted.

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Zhiquan Hou, Wenbo Pei, Xing Zhang, Yuxi Liu, Jiguang Deng et Hongxing Dai. « Oxidative Removal of Volatile Organic Compounds over the Supported Bimetallic Catalysts ». Global Environmental Engineers 7 (16 juillet 2020) : 1–27. http://dx.doi.org/10.15377/2410-3624.2020.07.1.

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Volatile organic compounds (VOCs) and methane are pollutants that are harmful to the atmosphere and human health. It is highly required to control emissions of VOCs. Catalytic oxidation is one of the most effective pathways for the elimination of VOCs, in which the key issue is the development of novel and high-performance catalysts. In this review article, we briefly summarize the preparation strategies, physicochemical properties, catalytic activities, and stability for the oxidative removal of VOCs of the supported bimetallic catalysts that have been investigated by our group and other researchers. The supported bimetallic catalysts include the supported noble bimetal, supported noble metal-transition metal, and supported non-precious bimetal catalysts. It was found that catalytic performance was related to one or several factors, such as specific surface area, pore structure, particle size and dispersion, adsorbed oxygen species concentration, reducibility, lattice oxygen mobility, acidity, reactant activation ability, and/or interaction between bimetals or between metal and support. The stability and ability of anti-poisoning to water, carbon dioxide or chlorine were related to the nature of the bimetal and support in the catalysts. In addition, we also envision the development trend of such a topic in the future work.

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Romanenko, Victor, Leonid Golovko, Mykhailo Bloshchytsyn et Viktor Dubniuk. « PRODUCTION OF BIMETALLIC MATERIALS WITH THE USE OF SPECIAL HOLDING ELEMENTS ». Technical Sciences and Technologies, n^o 1(27) (2022) : 82–91. http://dx.doi.org/10.25140/2411-5363-2022-1(27)-82-91.

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The analysis of existing methods and a new combined process of bimetal production are presented, according to which a special regular design of holders is created on the surface of its functional component by means of laser or arc welding. Themelt of the structural component of the bimetal is fed to the surface of the functional component through the hole in the form of a special device with a given flow rate. Holders are made of wire. The holders are located on the surface of the working plate at an angle or perpendicular to the base, followed by bending after assembly. The number of holders, their geometry and relative position on the surface are determined by the size of the bimetal. You can change the required parameters of the strength of adhesion in different areas. Full filling of technological space between holders filled with metal guarantees reliable fastening ofbimetallic plates. Various options have been developed and implemented to reduce the cost of bimetal production technology. There are options where not the whole surface is filled, but only the specified areas of the prepared holes. This allows to implement multi-layer metal structures. A cheap and simple method of obtaining bimetallic plates without the need for foundry operations and equipment is the use of welding technology. It has been proven that in order to ensure high bond strength of bimetallic components and uniform distribution on the joint plane, it is necessary that the frequency of the holders and the step between them havethe optimal value. The high efficiency of a new, innovative combined technology of bimetal production has been demonstrated.The introduction of these technologies in the production of bimetals does not require large material costs and ensures maximum profitability of the manufacturing process of such materials. The presence of several manufacturing methods allows you to select the most optimal technology depending on the volume of production and the size of the resulting sheets of bimetals or individual products from them.

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Clement, Todd E., Daniel J. Nurco et Kevin M. Smith. « Synthesis and Characterization of a Series of Monometallo-, Bimetallo-, and Heterobimetallo-1,2-Ethene-Linked Cofacial Bisporphyrins ». Inorganic Chemistry 37, n^o 6 (mars 1998) : 1150–60. http://dx.doi.org/10.1021/ic970774p.

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Sunden, Fanny, Ishraq AlSadhan, Artem Lyubimov, Tzanko Doukov, Jeffrey Swan et Daniel Herschlag. « Differential catalytic promiscuity of the alkaline phosphatase superfamily bimetallo core reveals mechanistic features underlying enzyme evolution ». Journal of Biological Chemistry 292, n^o 51 (25 octobre 2017) : 20960–74. http://dx.doi.org/10.1074/jbc.m117.788240.

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Jaime, Elke, et Jennie Weston. « Mechanism of the MeOH/H2O Substitution in a Series of Biomimetic Bimetallo Zinc-Based H3O2 Complexes ». European Journal of Inorganic Chemistry 2006, n^o 4 (février 2006) : 793–801. http://dx.doi.org/10.1002/ejic.200500450.

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Khaimovich, Alexander, Yaroslav Erisov, Vitaliy Smelov, Anton Agapovichev, Ilia Petrov, Vasilii Razhivin, Igor Bobrovskij, Viktoriya Kokareva et Alexander Kuzin. « Interface Quality Indices of Al–10Si–Mg Aluminum Alloy and Cr18–Ni10–Ti Stainless-Steel Bimetal Fabricated via Selective Laser Melting ». Metals 11, n^o 1 (19 janvier 2021) : 172. http://dx.doi.org/10.3390/met11010172.

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Bimetallic materials are important in many industries (aerospace, medicine, etc.) since they allow the creation of constructions that combine specific functional properties, for example, low density (aluminum alloy) and high corrosion resistance (stainless steel), due to layering fabrication of the bimetallic joint. On the other hand, the difference in thermophysical properties of the dissimilar material layers leads to residual stresses, which cause deformation and destruction of such a bimetallic joint produced via the methods of surfacing or additive technologies. This article discusses the methods based on the gray relational analysis and generalized desirability function for the quality assessment of Al–10Si–Mg aluminum alloy and Cr18–Ni10–Ti stainless-steel bimetal fabricated via selective laser melting (SLM). There are four main parameters (quality indices) of the quality generalized assessment, which determine the degree of Al penetration into the steel substrate and Fe into the deposited layer, the difference in microhardness values on both sides of the interface boundary, and the resistance to mechanical destruction of the bimetallic joint. According to the results obtained, the best set of quality indices corresponds to the SLM technological modes with an energy density of 105 and 147 J/mm3. The greatest functionality of the bimetals is determined by the quality index associated with its strength. Therefore, methods of gray relational analysis and desirability function make it possible to form a generalized assessment for the bimetallic joint quality and, consequently, to select the best technological mode.

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11

Lekhov, O. S., A. V. Mikhalev et M. M. Shevelev. « Production of three-layer steel bimetallic strips in the unit of continuous casting and deformation. Report 1 ». Izvestiya. Ferrous Metallurgy 62, n^o 8 (13 septembre 2019) : 594–99. http://dx.doi.org/10.17073/0368-0797-2019-8-594-599.

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High technical and economic efficiency of the use of bimetals in chemical, oil, transport and energy engineering and other industries is described. The urgency of creating high-performance continuous processes for the production of bimetallic strips is substantiated. The authors have established the main technological tasks for development of the processes of obtaining bimetal of wide class. The paper describes resource-saving production technology of three-layer bimetals alloyed steel – constructional steel – alloyed steel at the unit of combined process of continuous casting and deformation. Possibilities of the proposed technology are outlined from the standpoint of improving the quality of bimetallic strips. The initial data are given to determine the temperature change over time of the main steel strip as it passes through the molten metal of the alloyed steel. The equations are given for non-stationary heat conduction, initial and boundary conditions for determining the temperature fields of main strip and cladding layer when obtaining a three-layer bimetallic strip on the unit of a combined process of continuous casting and deformation. The values of density, thermal conductivity and heat capacity for steel St3 were determined in a given temperature range. A procedure is described for calculating temperatures in the ANSYS package by solving a non-stationary heat conduction problem in a flat formulation by the finite element method. The authors have described the geometric model for calculating the temperature of strip and molten metal of the cladding layer. Values of the coefficient of heat transfer between the main strip and molten metal of the cladding layers of bimetallic strip are given adopted for calculation. Characteristic points are indicated in the model for calculating the temperatures of main strip and molten metal of the cladding layer. The graphs show temporal changes in these temperatures at production of a three-layer bimetallic strip on the unit of combined process of continuous casting and deformation. Calculated data on the time variation of temperature of main strip and molten metal of the cladding layer at characteristic points are given for different values of the contact heat transfer coefficient.

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Lekhov, O. S., et M. M. Shevelev. « Evaluation of the quality of three-layer steel bimetallic strips obtained on a unit of continuous casting and deformation ». Izvestiya. Ferrous Metallurgy 64, n^o 10 (24 novembre 2021) : 755–60. http://dx.doi.org/10.17073/0368-0797-2021-10-755-760.

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Today there is an urgency of creating high-performance continuous processes for the production of bimetals. The article describes the main tasks of improving the quality of the materials under consideration. Two stages of the technology for producing steel three-layer bimetallic strips on the unit of a combined continuous casting and deformation process are considered. The authors give recommendations on the conduct of the technological process in order to obtain high-quality bimetallic strips on such unit. The problem statement is presented. The material considers initial data for determining the temperature of the steel base strip and the stress-strain state of the metals of the cladding layers and the strip in deformation center of a three-layer bimetallic ingot. A model for calculating and a method for solving problems of thermal conductivity and elastoplasticity are shown. Regularities of the temperature change of the main steel strip are given during its passage through the molten metal of the cladding layer. Stress-strain state of the metals of the main strip and cladding layers in the deformation center was determined when three-layer bimetallic steel strips were obtained on the unit of combined continuous casting and deformation process. The authors describe the values of compression of the main steel strip and mutual displacement of the layers during compression of the bimetallic ingot by the strikers. Regularities of the distribution of axial and tangential stresses are shown along the contact line of the cladding layer with the striker. The evaluation of the process of obtaining bimetal steel 09G2S - steel 13KhFA - steel 09G2S was made on a pilot unit for continuous casting and deformation. Microstructure of the main strip and cladding layers of a three-layer bimetallic steel strip is shown when a combined continuous casting and deformation process is obtained in one unit.

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Chudakov, I. B., N. L. Fedotova et I. V. Saikov. « Special Features of Formation of the High Damping State in Bimetallic Structural Materials Obtained by Explosion Welding ». Key Engineering Materials 887 (mai 2021) : 28–33. http://dx.doi.org/10.4028/www.scientific.net/kem.887.28.

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Special features of the high-damping state formation in bimetallic materials produced by explosion welding have been studied. High-damping Mn-Cu alloy was used for the damping base of the bimetallic composite and high–strength steel (grade: 30HGSA) was used to form the coating layer. The effect of planar tensile stresses (observed in the damping component of the bimetal and caused by valuable difference between coefficients of thermal expansion of components of the bimetal) is discussed. Damping properties of bimetallic materials were found to be comparable with damping characteristics of monolithic high damping alloys. High-strength steel provides high-strength characteristics of the surface layer of the bimetal, where the strength level reaches 1100MPa and the hardness is equal to 50 HRC. Obtained combination of high damping and high strength in developed bimetallic materials provides real chance for practical application of these materials in industry.

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Aignătoaie, Mihail. « FEA Study on the Elastic Deformation Process of a U-Shape Bimetal Actuator ». Advanced Materials Research 837 (novembre 2013) : 305–9. http://dx.doi.org/10.4028/www.scientific.net/amr.837.305.

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Bimetal actuators are frequently used in engineering applications. The literature for the design of bimetal actuators recommends only approximate analytical formulas for various bimetal structures, all with constant section on the entire length. No reference was found for bimetals with variable cross-section or bimetals shape optimization. Topology and shape optimization specialized software packages are not always an available or easy to use option. The paper presents a Finite Element Analysis, FEA, for a U-shaped bimetal with equal legs, considering both mechanical and thermal loads. FEA modeling aspects and some suggestions considering possible new shape modifications for this type of actuator are discussed.

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Li, Gaojie, Wenshuang Zhang, Na Luo, Zhenggang Xue, Qingmin Hu, Wen Zeng et Jiaqiang Xu. « Bimetallic Nanocrystals : Structure, Controllable Synthesis and Applications in Catalysis, Energy and Sensing ». Nanomaterials 11, n^o 8 (26 juillet 2021) : 1926. http://dx.doi.org/10.3390/nano11081926.

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In recent years, bimetallic nanocrystals have attracted great interest from many researchers. Bimetallic nanocrystals are expected to exhibit improved physical and chemical properties due to the synergistic effect between the two metals, not just a combination of two monometallic properties. More importantly, the properties of bimetallic nanocrystals are significantly affected by their morphology, structure, and atomic arrangement. Reasonable regulation of these parameters of nanocrystals can effectively control their properties and enhance their practicality in a given application. This review summarizes some recent research progress in the controlled synthesis of shape, composition and structure, as well as some important applications of bimetallic nanocrystals. We first give a brief introduction to the development of bimetals, followed by the architectural diversity of bimetallic nanocrystals. The most commonly used and typical synthesis methods are also summarized, and the possible morphologies under different conditions are also discussed. Finally, we discuss the composition-dependent and shape-dependent properties of bimetals in terms of highlighting applications such as catalysis, energy conversion, gas sensing and bio-detection applications.

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Li, Fa Gen, Bin Wei, Zhen Quan Bai et Xue Hui Zhao. « Performance Analysis on CRA-Clad Pipes Extruded from Bimetallic Centrifugal Castings ». Advanced Materials Research 287-290 (juillet 2011) : 2288–93. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.2288.

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Recently a new method for manufacturing bimetal clad pipes is introduced, which can integrate centrifugal casting with extrusion technology organically. Through experimental study on microstructure and properties of bimetallic clad pipes manufactured by centrifugal casting and extruding, the results indicates that bimetal clad pipes with intact metallurgical interface have good bonding properties. Meanwhile wider interfacial zone will be favorable for reducing deformation stress. However there are still a few technical difficulties about the bimetallic clad pipe. Due to chemical composition and properties difference between backing materials and CRA layer, chemical elements will spread and microstructure will change during the process of production and even mechanical behavior of backing metal pipe and corrosion resistance of CRA layer will decline. To meet application requirements, appropriate heat treatment with bimetal clad pipes seems vita.

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Zhang, Ling, Jiawei Huang, Qizheng Zheng, Ang Li, Xianglan Li, Jing Li, Minhua Shao et al. « “Superaerophobic” NiCo bimetallic phosphides for highly efficient hydrogen evolution reaction electrocatalysts ». Chemical Communications 57, n^o 50 (2021) : 6173–76. http://dx.doi.org/10.1039/d1cc01698a.

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Wang, Qi, Qi Fei Zheng et De Fu Li. « Development of Copper Alloy-Steel Bimetallic Bearing Materials and Manufacturing Technology ». Materials Science Forum 993 (mai 2020) : 374–83. http://dx.doi.org/10.4028/www.scientific.net/msf.993.374.

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Combining copper alloy with steel back to make bearing bush can not only improve the strength of bearing bush, but also prolong the life of bearing bush, which is called bimetallic bearing. In this paper, the development status of copper alloy materials in bimetallic bearing bushes and the manufacturing principle and characteristics of copper alloy-steel bimetallic bearing bushes are summarized, and the defects of several manufacturing processes are analyzed. This paper summarizes the research on improving the performance of copper-steel bimetallic bearing bush. Finally, the development direction of the preparation process of copper alloy-steel bimetal is prospected.

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Aghaei, Elham, Zexiang Wang, Bogale Tadesse, Carlito Tabelin, Zakaria Quadir et Richard Alorro. « Performance Evaluation of Fe-Al Bimetallic Particles for the Removal of Potentially Toxic Elements from Combined Acid Mine Drainage-Effluents from Refractory Gold Ore Processing ». Minerals 11, n^o 6 (31 mai 2021) : 590. http://dx.doi.org/10.3390/min11060590.

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Acid mine drainage (AMD) is a serious environmental issue associated with mining due to its acidic pH and potentially toxic elements (PTE) content. This study investigated the performance of the Fe-Al bimetallic particles for the treatment of combined AMD-gold processing effluents. Batch experiments were conducted in order to eliminate potentially toxic elements (including Hg, As, Cu, Pb, Ni, Zn, and Mn) from a simulated waste solution at various bimetal dosages (5, 10, and 20 g/L) and time intervals (0 to 90 min). The findings show that metal ions with greater electrode potentials than Fe and Al have higher affinities for electrons released from the bimetal. Therefore, a high removal (> 95%) was obtained for Hg, As, Cu, and Pb using 20 g/L bimetal in 90 min. Higher uptakes of Hg, As, Cu, and Pb than Ni, Zn, and Mn also suggest that electrochemical reduction and adsorption by Fe-Al (oxy) hydroxides as the primary and secondary removal mechanisms, respectively. The total Al3+ dissolution in the experiments with a higher bimetal content (10 and 20 g/L) were insignificant, while a high release of Fe ions was recorded for various bimetal dosages. Although the secondary Fe pollution can be considered as a drawback of using the Fe-Al bimetal, this issue can be tackled by a simple neutralization and Fe precipitation process. A rapid increase in the solution pH (initial pH 2 to >5 in 90 min) was also observed, which means that bimetallic particles can act as a neutralizing agent in AMD treatment system and promote the precipitation of the dissolved metals. The presence of chloride ions in the system may cause akaganeite formation, which has shown a high removal capacity for PTE. Moreover, nitrate ions may affect the process by competing for the released electrons from the bimetal owing to their higher electrode potential than the metals. Finally, the Fe-Al bimetallic material showed promising results for AMD remediation by electrochemical reduction of PTE content, as well as acid-neutralization/metal precipitation.

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Saikov, I. V., I. B. Chudakov, N. L. Fedotova, N. M. Alexandrova, N. A. Polyakova et S. Yu Makushev. « HIGH-DAMPING STATE IN STRUCTURAL BIMETALS OBTAINED BY EXPLOSION WELDING ». IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, n^o 11(246) (26 novembre 2020) : 69–76. http://dx.doi.org/10.35211/1990-5297-2020-11-246-69-76.

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Structural bimetallic materials consisting from high-strength steel (grade: 30HGSA) and binary (or alloyed) high-damping Mn-Cu alloys have been studied in the present research. Formation of the high-damping state in laminated materials obtained by explosion welding has been discussed. It is shown that the combination of high damping properties and high strength in the developed bimetallic materials provides an opportunity for practical application of high-damping bimetals in industry.

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Fu, Fenglian, Zihang Cheng et Jianwei Lu. « Synthesis and use of bimetals and bimetal oxides in contaminants removal from water : a review ». RSC Advances 5, n^o 104 (2015) : 85395–409. http://dx.doi.org/10.1039/c5ra13067k.

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Shaparev, A. V., et I. Savin. « Calculation of the Amount of the Reduction Required for the Formation of Compound Layers during Cold Rolling of Bimetals ». Materials Science Forum 870 (septembre 2016) : 328–33. http://dx.doi.org/10.4028/www.scientific.net/msf.870.328.

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Calculated values of joint plastic deformation for forming a connection layer of the bimetal during cold rolling. Deflection of the primary setting of the bimetal layers depends on the thickness and sizes of destruction blocks, the ratio of the geometric shapes of the blocks of the surface layer destruction, the external friction during rolling, the strip tension, the diameter of the rolls, the thickness of the bimetallic billet.

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Karolczuk, Aleksander, et Mateusz Kowalski. « Structural and Fatigue Properties of Titanium-Steel Bimetallic Composite Obtained by Explosive Welding Technology ». Key Engineering Materials 592-593 (novembre 2013) : 594–97. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.594.

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Structure of bimetallic composite obtained during explosive welding process exhibits strong heterogeneity in the vicinity of interface. The interface usually has a wavy shape with characteristic increase of hardness and largely deformed grains. Recently obtained fatigue tests for titanium-steel bimetal specimens under fully reversed push-pull loading show ratcheting phenomenon. In order to investigate this phenomenon mechanical testing and structural observations of titanium-steel bimetal and titanium before cladding have been performed. Fatigue characteristics in the form of relation between strain amplitude and fatigue life for titanium (Grade 1), steel (S355J2+N) and bimetal will be presented.

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Pervukhina, O. L., et I. V. Denisov. « TWO-LAYER STEEL FOR CRITICAL METAL STRUCTURES ». IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, n^o 11(246) (26 novembre 2020) : 46–52. http://dx.doi.org/10.35211/1990-5297-2020-11-246-46-52.

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The paper discusses main methods for obtaining and application of large-sized bimetal: batch rolling, electric arc welding, electroslag surfacing with subsequent rolling, explosion welding. Test results of double-layer steels sheets and experience in bimetal production prove this technology availability for critical metal structures in petrochemical and nuclear engineering or shipbuilding. The universality of the industrial explosion welding allows production of wide range bimetal compounds of 100% integrity both for a single sheet and large-tonnage lots (several hundred tons) and practically unlimited sizes. The features of heat treatment for various bimetals after explosion welding are presented.

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Karolczuk, Aleksander. « Ratcheting Simulation in a Titanium-Steel Bimetallic Plate Based on the Chaboche Hardening Model ». Acta Mechanica et Automatica 10, n^o 4 (1 décembre 2016) : 265–70. http://dx.doi.org/10.1515/ama-2016-0040.

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Abstract The paper presents the results of fatigue loading simulation applied to bimetallic model using the Chaboche kinematic hardening rule. Three cases of simulations were performed: (i) without residual stresses; (ii) considering residual stresses and (iii) considering asymmetrical geometry of bimetal, i.e. cross area reducing under tension period of loading. Experimental results exhibit the ratcheting phenomenon in titanium-steel bimetallic specimens. The observed ratcheting phenomenon could be explained by the third case of simulation which is supported by detection of microcracks in the vicinity of welded area.

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Lekhov, O. S., A. V. Mikhalev et M. M. Shevelev. « PRODUCTION OF THREE-LAYER STEEL BIMETALLIC STRIPS IN THE UNIT OF CONTINUOUS CASTING AND DEFORMATION. REPORT 2 ». Izvestiya. Ferrous Metallurgy 62, n^o 10 (3 novembre 2019) : 763–68. http://dx.doi.org/10.17073/0368-0797-2019-10-763-768.

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The paper states urgency of the problem of determining stressstrain state of metals of the cladding layer and the main strip in production of three-layer bimetal: alloyed steel-constructional steelalloyed steel. Temperature field of the main strip and cladding layer is given to calculate stress-strain state of metals of three-layer bimetallic strip. Initial data for calculating this stress-strain state are given. To assess the effect of coefficient of friction between cladding layer s and the main strip on stress-strain state of metals in deformation zone, three values of it are taken. Geometric model is described for calculating stress-strain state and metal flow in deformation center of cladding layer. Characteristic lines and points of calculation are provided. Technique for solving the problem of determining stresses and flows in deformation focus is described by finite element method using ANSYS app. Regularities of flow of cladding layer’s metal along the length of deformation center and movement of the main strip of bimetallic ingot are given. Values of mutual displacement of layers of bimetallic strip are determined as a function of deformation degree of the cladding layer. And the recommendations are given on this degree to improve quali ty of a three-layer bimetal. Regularities of distribution of axial and tangential stresses in deformation center are presented for production of steel three-layer bimetallic strips in the unit of combined continuous casting and deformation. Stress state of the cladding layer’s metal in focus of cyclic deformation was estimated from the position of improving quality of three-layer bimetallic strips produced in such unit.

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Jia, Yanlong, Huiping Qi, Mengmeng Pei, Zhenjiang Li, Fangcheng Qin et Lu Jia. « Hot Deformation Behavior Coordination and Processing Maps of 40Cr/Q345B Bimetallic Blank by Centrifugal Casting ». Metals 12, n^o 8 (29 juillet 2022) : 1281. http://dx.doi.org/10.3390/met12081281.

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The compact cast-rolling compound forming of bimetallic ring is an efficient process for manufacturing large bimetallic rings. The difference in hot deformation behavior of the two metals directly affects the coordinated deformation of bimetals during hot rolling. In this paper, hot compression tests of 40Cr/Q345B bimetallic blank produced by centrifugal casting were carried out at temperatures of 950–1200 °C and strain rates of 0.005–5 s−1. Based on the comparisons of flow stress behavior, activation energy, and activation volume, hot deformation behavior coordination of 40Cr/Q345B bimetallic blank was investigated. Processing maps were established to study the optimum processing windows for 40Cr/Q345B bimetallic blank. Under the same deformation conditions, 40Cr shows lower overall flow stress than Q345B, which facilitate the coordinated deformation of the bimetallic blank during rolling, and the flow stress difference between 40Cr and Q345B decreases with the increase of temperature. It was connected with the increase in the second phase particles pinning effect for higher MnS content in Q345B. The common rate-controlling mechanism for 40Cr and Q345B is the thermal breaking of attractive junctions and movement of jogged screw dislocations. The bimetallic blanks exhibit good deformation coordination in the optimum processing window (1030–1100 °C and 0.5–1 s−1 with a strain of 0.6).

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Avcı, Uğur, et Yusuf Eren Erdoğdu. « Microstructure and mechanical properties of a semi-centrifugal compression processed Al6013 and Cu bimetal ». Materials Testing 63, n^o 11 (1 novembre 2021) : 1058–62. http://dx.doi.org/10.1515/mt-2021-0040.

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Abstract In this study, aluminum Al6013 and copper (Cu) cylindrical bimetal was manufactured by means of an original production method. The optical microscope and scanning electron microscope (SEM) images of the bimetal material produced through this approach, semi-centrifugal compression, were used in microstructural investigations following which metallurgical transition zones were defined. Through an energy dispersive X-ray (EDX) analysis of the defined regions, the chemical content of the regions were determined. Micro hardness values of the regions were determined and comparisons were made with the chemical content and hardness values of the materials used in the bimetal production before the manufacturing process. In addition, the mechanical properties of the materials were compared by applying tensile tests to the bimetallic components Cu and Al6013 and to the bimetal material produced. In the light of the values obtained, the general properties of the bimetal material produced through this new approach were presented.

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Swiatkowska-Warkocka, Zaneta. « Bimetal CuFe Nanoparticles—Synthesis, Properties, and Applications ». Applied Sciences 11, n^o 5 (24 février 2021) : 1978. http://dx.doi.org/10.3390/app11051978.

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Bimetal CuFe (copper-iron) nanoparticles, which are based on the earth-abundant and inexpensive metals, have generated a great deal of interest in recent years. The possible modification of the chemical and physical properties of these nanoparticles by changing their size, structure, and composition has contributed to the development of material science. At the same time, the strong tendency of these elements to oxidize under atmospheric conditions makes the synthesis of pure bimetallic CuFe nanoparticles still a great challenge. This review reports on different synthetic approaches to bimetallic CuFe nanoparticles and bimetallic CuFe nanoparticles supported on various materials (active carbide, carbide nanotubes, silica, graphite, cellulose, mesoporous carbide), their structure, physical, and chemical properties, as well as their utility as catalysts, including electrocatalysis and photocatalysis.

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Wang, Xiaoming, Boen Tang, Linlin Wang, Dongyun Wang, Weiping Dong et Xiping Li. « Microstructure, Microhardness and Tribological Properties of Bronze–Steel Bimetallic Composite Produced by Vacuum Diffusion Welding ». Materials 15, n^o 4 (20 février 2022) : 1588. http://dx.doi.org/10.3390/ma15041588.

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In this paper, a lead–bronze/steel bimetal composite was produced by vacuum diffusion welding technology. The microstructure, hardness and tribological properties under the dry sliding condition of the bimetal structured material were investigated and compared with two reference samples, i.e., lead–bronze and Mn/Si–brass. The wear mechanism of the three materials was also analyzed in detail. It was found that the bimetallic structure possessed the best wear resistance among the three samples. When paired with the ball bearing steel, the wear rates of the lead–bronze and Mn/Si–brass were 13 and 54 times higher than that of the bimetal composite. When paired with bearing steel, the wear rates of the two materials were 13 and 54 times higher than the bimetallic composite, respectively. This is because the steel layer served as a bearing layer to decrease the plastic deformation of the bronze layer. Furthermore, the lead can accelerate the formation of a dense hardened layer at the sliding interfaces to avoid subsequent wear of the bronze surface. Nevertheless, this hardened layer caused severe scuffing on the steel balls. Therefore, lead–bronze/steel structured material is recommended to match with hard counterface material, such as cemented carbide.

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., Sarjiyana, Subagiyo Subagiyo et Lisa Agustriyana. « PENGARUH PENGATURAN KUAT ARUS DAN VOLTASE TERHADAP KEKUATAN TARIK PADA PENGELASAN BIMETAL PLAT BAJA KARBON RENDAH DAN STAINLESS STEEL 304 DENGAN LAS GMAW ». Jurnal Energi dan Teknologi Manufaktur (JETM) 4, n^o 02 (31 décembre 2021) : 7–12. http://dx.doi.org/10.33795/jetm.v4i02.103.

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A manufactured product in the form of a mixture of dissimilar materials (bimetal) must be considered, including: selecting the right metal, selecting the appropriate filler, setting the current and voltage, etc. For this reason, research related to bimetallic welding using Gas Metal Arc Welding (GMAW) was conducted. The aims were to determine the effect of current on the tensile strength of bimetallic welding of low carbon steel and stainless steel 304 using GMAW welding, to determine the effect of voltage on the tensile strength of bimetallic welding, and to determine the effect of the interaction of current and voltage on the tensile strength of bimetallic welding using welding. GMAW. The research method used is experimental where the results of bimetallic welding are tested by the destructive test method. The results showed that current, voltage, and the strong interaction between current and voltage affect the tensile strength of bimetallic welding of low carbon steel and stainless steel 304 using GMAW welding. The use of amperes between 120A-160A and a voltage of 19V-22V gives a small difference and a tensile strength of 300 MPa-330 MPa.

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Halaczek, Dariusz, et Eugeniusz Hadasik. « Influence of the Materials Combination for the Surface Temperature of the Bimetallic Wire Deformed in the Cold Drawing Process ». Solid State Phenomena 226 (janvier 2015) : 53–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.226.53.

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The article discusses the mathematical and practical methodology for evaluating the temperature on the surface of bimetallic wire after deformation in the drawing die. The components of bimetallic wire on the cross-section are the following materials: - a core, brass M63 (CuZn37) - shell M1E copper (Cu – ETP), - a core, aluminum Al (A199, 5) - shell M1E copper (Cu – ETP). An outer layer (shell) in such combinations is always a copper with two different thicknesses of 1.5 mm and 0.5 mm, which means that the proportion of copper on the cross section of the bimetal was respectively 64% and 32%. The bimetallic wires samples used for measurements were obtained by mechanical cladding. In the first step of the process, the cooper tubes M1E were put on the aluminium and brass wires M63, and then in a second step, each set combination was subjected to a simultaneous deformation with a total true strain φlc~ 1. Thus obtained the bimetal wires were the blank material for determining the surface temperature. In the drawing process there were used two different drawing speeds, and for each was applied the two individual size of deformation of 15% and 30%. The temperature on the surface of the layered wire depending on the single deformation and drawing speed was determined using a thermographic camera and it was also calculated according to mathematical formulas. The article discusses the preliminary results necessary to conduct further deliberations on the temperature decomposition on the longitudinal section of the bimetallic wire deformed in the drawing die.

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Settimi, Clarissa, Daniela Zingaretti, Simone Sanna, Iason Verginelli, Igor Luisetto, Antonello Tebano et Renato Baciocchi. « Synthesis and Characterization of Zero-Valent Fe-Cu and Fe-Ni Bimetals for the Dehalogenation of Trichloroethylene Vapors ». Sustainability 14, n^o 13 (25 juin 2022) : 7760. http://dx.doi.org/10.3390/su14137760.

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In this study, zero-valent iron-copper (Fe-Cu) and iron-nickel (Fe-Ni) bimetals were prepared by disc milling for the dehalogenation of trichloroethylene vapors. For both Fe-Ni and Fe-Cu, three combinations in terms of percentage of secondary metal added were produced (1%, 5%, 20% by weight) and the formation of the bimetallic phase by milling was evaluated by X-ray diffraction (XRD) analysis. The disc milled bimetals were characterized by a homogenous distribution of Ni or Cu in the Fe phase and micrometric size visible from scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) analysis and by a relatively low specific surface area (0.2–0.7 m2/g) quantified by the Brunauer–Emmett–Teller (BET) method. The reactivity of the produced bimetals was evaluated by batch degradation tests of TCE in the gas phase with 1 day of reaction time. Fe-Ni bimetals have shown better performance in terms of TCE removal (57–75%) than Fe-Cu bimetals (41–55%). The similar specific surface area values found for the produced bimetals indicated that the enhancement in the dehalogenation achieved using bimetals is closely related to the induced catalysis. The obtained results suggest that ZVI-based bimetals produced by disc milling are effective in the dehalogenation of TCE vapors in partially saturated conditions.

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Dlamini, Nkosinathi Goodman, Albertus Kotze Basson et Viswanadha Srirama Rajasekhar Pullabhotla. « Synthesis and Characterization of Various Bimetallic Nanoparticles and Their Application ». Applied Nano 4, n^o 1 (3 janvier 2023) : 1–24. http://dx.doi.org/10.3390/applnano4010001.

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Bimetallic nanoparticles are a complex nanoscale combination of two metal constituents. The superior properties of bimetallic nanoparticles (BNPs) compared with monometallic nanoparticles have attracted much attention from both scientific and technological perspectives. In recent years, many fabrication techniques have been proposed, and the detailed characterization of bimetallic nanoparticles has been made possible by the rapid advancement of nanomaterial analysis techniques. Metallic nanoparticles can be classified according to their origin, size, and structure, and their synthesis process can be physical, chemical, or biological. Bimetallic nanoparticles are more attractive than metal nanoparticles due to their unique mixing patterns and synergistic effects of two metal nanoparticles forming the bimetal. In this review, the different bimetallic synthesis methods and various characterization techniques are discussed. The paper will also discuss various applications for bimetallic nanoparticles. Different characterization techniques for bimetallic nanoparticles include X-ray diffraction (XRD) to investigate crystallinity and phase composition; the morphology and composition analysis of nanoparticles are studied using a scanning electron microscope fitted with an energy-dispersive X-ray analyzer (EDX); transmission electron microscopy (TEM), UV–vis spectrum, FTIR, and TGA analysis are also among the characterization tools used. Finally, we report on the various applications of BNPs, which include antimicrobial activity, pollutant removal, and wastewater application.

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Jáňa, Miroslav, Milan Turňa, Jozef Ondruška et Petr Nesvadba. « The Effect of Atmosphere and Vacuum on Character of Weld Joints Fabricated by Explosion ». Advanced Materials Research 875-877 (février 2014) : 1472–76. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1472.

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This paper presents an experiment conducted in Explosia, a.s., Pardubice. A bimetal prepared of AZ 31 Mg alloy - CrNi austenitic steel was tested in various conditions, and consequently its quality was assessed. Focus was particularly on the impact of atmosphere and vacuum on the interface character of the metals (bimetals) prepared by explosion. Parallel placement of the materials being welded was used for welding in both vacuum and air atmosphere. Welding sets were designed and manufactured. The welding parameters and conditions were set up utilising the available computational means, and then verified by simulation in ANSYS engineering-scientific program. Used was Semtex S 35, a loose explosive, as well as Startline 12, an initiation explosive. Bimetal was fabricated in the air atmosphere at the detonation speed 2613 m.s-1 and in vacuum at the detonation speed 2597 m.s-1. Quality of bimetals was assessed by optical microscopy, measuring deformations by a 3D scanner, measuring microhardness and also by EDX microanalysis.

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Nonyak, D. V., I. V. Denisov et О. L. Pervukhina. « The influence of the technological cycle of production on the change in the physical and mechanical characteristics of bimetal with a butt welded joint in the cladding layer ». Industrial laboratory. Diagnostics of materials 87, n^o 7 (24 juillet 2021) : 59–66. http://dx.doi.org/10.26896/1028-6861-2021-87-7-59-66.

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The goal of the study is to consider the effect of explosion welding, heat treatment and cold straightening (gagging) in production of 09G2S + 08Kh13 bimetal with a butt welded joint in the cladding layer on the evolution of residual internal stresses. The impact of technological operations on the change in the level of residual stresses in a bimetallic material with a welded butt joint in the cladding layer was carried out using a non-destructive method of the magnetic memory of metals (MMM). This method is based on the use of the intrinsic stray magnetic field formed in the zones of increased dislocation density. The results revealed the special features of the location of zones with maximum values of the stress field gradient (dH/dx) and their evolution upon production of 09G2S + 08Kh13 bimetal with a butt welded joint in the cladding layer. An increase in the level of residual stresses in the cladding layer occurs after manual electric arc welding of 2 parts of the cladding layer made of 08Kh13 steel. It is shown that after explosion welding the level of residual stresses change. The stress relaxation occurs in the zone of weld in the cladding layer. At the same time, an increase in the level of residual stresses is observed in the main and cladding layer of the bimetal. To reduce the high level of residual stresses, we used the subsequent heat treatment of the obtained bimetallic samples in two different modes. The optimal heat treatment mode (heating to 720 ± 20°C, holding for 2 h, cooling with a furnace) which excluded the crack formation in the cladding layer upon mechanical straightening of bimetal was specified for 09G2S + 08Kh13 bimetal sample with a butt welded joint in the cladding layer.

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Guan, Feng, Suo Fan, Junlong Wang, Guangyu Li, Zheng Zhang et Wenming Jiang. « Effect of Vibration Acceleration on Interface Microstructure and Bonding Strength of Mg–Al Bimetal Produced by Compound Casting ». Metals 12, n^o 5 (29 avril 2022) : 766. http://dx.doi.org/10.3390/met12050766.

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Vibration was adopted to enhance the interface bonding of Mg–Al bimetal prepared by the lost foam compound casting (LFCC) technique. The Mg–Al bimetallic interface was composed of three layers: layer I (Al3Mg2 and Mg2Si phases), layer II (Al12Mg17 and Mg2Si phases), and layer III (Al12Mg17 + δ-Mg eutectic structure). With the increase in vibration acceleration, the cooling rate of the Mg–Al bimetal increased, resulting in the decrease in the reaction duration that generates the intermetallic compounds (IMCs) layer (including layers I and II) and its thickness. On the other hand, the Mg2Si phase in the IMCs layer was refined, and its distribution became more uniform with the increase in the vibration acceleration. Finally, the shear strength of the Mg–Al bimetal continued to increase to 45.1 MPa when the vibration acceleration increased to 0.9, which was 40% higher than that of the Mg–Al bimetal without vibration.

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Karolczuk, Aleksander, Krzysztof Kluger, Mateusz Kowalski et Mariusz Prazmowski. « The Effect of the Detonation Velocity in Explosively Welded Steel-Zirconium Bimetal on the Residual Stresses Determined by the Hole-Drilling Method ». Solid State Phenomena 224 (novembre 2014) : 181–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.224.181.

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As a result of the explosion welding, residual stresses are generated in the cladded material which can affect the properties of the bimetallic composite. This paper analyses the value of residual stresses in the steel-zirconium bimetal sheets, for which the detonation velocities were 1,0V0 (where V0 = 2200m/s); 1,3V0 and 1,6V0 with constant others welding parameters.

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Kuznetsov, Ruslan Valer'yevich, Mihail Mihailovich Radkevich et Pavel Alekseyevich Kuznetsov. « The Technology of Producing Layered Composite Materials on the Basis of Hypoeutectic Silumin AK9ch and Sintered Iron Powder AHC100.29 ». Key Engineering Materials 822 (septembre 2019) : 252–57. http://dx.doi.org/10.4028/www.scientific.net/kem.822.252.

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The paper presents a new technological scheme for obtaining bimetallic materials of the composition "aluminum casting alloy - sintered iron powder" by the method of joint stamping. The results of experimental studies of the effect of process conditions on the physicomechanical properties of the starting materials and the adhesive strength of the final bimetal blank are presented.

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Roy, Sourav, Michael G. B. Drew, Antonio Bauzá, Antonio Frontera et Shouvik Chattopadhyay. « Formation of a water-mediated assembly of two neutral copper(ii) Schiff base fragments with a Cu2(NCS)4moiety : exploration of non-covalent C–H⋯π(bimetallo ring) interactions ». CrystEngComm 20, n^o 12 (2018) : 1679–89. http://dx.doi.org/10.1039/c7ce01473b.

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The energetic features of dimer formation and water encapsulation in an interesting copper(ii) Schiff base complex, [(CuL)₂⊂(H₂O)][Cu₂(μ_1,3-NCS)₂(NCS)₂], have been studied using DFT calculations.

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41

Uścinowicz, Robert. « Effect of Elevated Temperature and Annealing Time on Mechanical Properties of Ti/Cu Bimetal ». Materials 15, n^o 23 (6 décembre 2022) : 8707. http://dx.doi.org/10.3390/ma15238707.

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The paper presents the results of the elastoplastic properties of Ti/Cu bimetallic rods. They were obtained by extrusion and composed of a copper core with a covered titanium layer. Experiments were carried out at room temperature on virgin samples, and samples were subjected to prior annealing in the temperature range of 600–900 °C for 30, 60, and 90 min. The modern technique of impulse excitation of vibration was used to analyze the elastic properties of bimetal, obtaining the temperature and time characteristics of Young’s modulus, internal friction, and resonance frequency variability. Subsequently, the samples were stretched to breakage, obtaining information on the values of limit stresses, their deformability, and the energy demand for uniform elastic–plastic deformation in terms of the effect of temperature and annealing time. The influence of thermal processes on the strengthening of the Ti/Cu bimetal was also examined, and microscopic observations and qualitative analysis of the diffusion zone at the interface of the phases were carried out. The research was to answer the question of how a short-term temperature increase in 600–900 °C affects the physical properties of Ti/Cu bimetallic rods. These rods were used as a high-density electric current carrier in metallurgical processes in environments of aggressive chemical compounds. Studies have shown that short-term annealing at elevated temperatures causes a drastic reduction in the strength of the Ti/Cu bimetal, leading to structural changes within the components, and the diffusion zone with the release of intermetallic compounds, leading to structural degradation. Heating at 900 °C for 60 and 90 min caused accelerated interface degradation and destruction of the Ti/Cu bimetal by delamination.

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Malakhov, Andrey Y., Ivan V. Saikov, Igor V. Denisov et Nemat N. Niyezbekov. « AlMg6 to Titanium and AlMg6 to Stainless Steel Weld Interface Properties after Explosive Welding ». Metals 10, n^o 11 (10 novembre 2020) : 1500. http://dx.doi.org/10.3390/met10111500.

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This paper studies the weld interface microstructure and mechanical properties of AlMg6-stainless steel and AlMg6-titanium bimetals produced using explosive welding. The microhardness (HV), tear strength, and microstructure of the weld seams were evaluated. The interface of the weld zones had a flat profile. No structural disturbances or heterogeneity in the AlMg6-titanium weld interface were observed. On the other hand, the bimetal AlMg6-stainless steel had extensive zones of cast inclusions in the 10–30 µm range. SEM/energy-dispersive X-ray spectroscopy (EDS) analysis showed the presence of a hard and brittle intermetallic compound of Al and FeAl3 (with 770–800 HV). The microhardness of the AlMg6-titanium bimetal grew higher closer to the weld interface and reached 207 HV (for AlMg6) and 340 HV (for titanium). Both bimetals had average tear strength below 100 MPa. However, the tear strength of some specimens reached 186 and 154 MPa for AlMg6-titanium and AlMg6-stainless steel, respectively. It is also worth mentioning that heat treatment at 200 °C for one hour led to a uniform distribution of tear strength along the entire length of the bimetals. The study shows that one of the possible solutions to the problem of the formation of the brittle intermetallic compounds would be the use of intermediate layers of refractory metals.

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He, Zhao, Cheng, Shangguan, Wen et Wang. « Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process ». Materials 12, n^o 19 (8 octobre 2019) : 3273. http://dx.doi.org/10.3390/ma12193273.

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A novel technique combining solid–liquid compound casting (SLCC) with arc spraying was designed to manufacture the arc-sprayed Al/AZ91D bimetals with a Zn interlayer. The Al/Mg bimetal was produced by pouring the AZ91D melt into the molds sprayed with Al/Zn double-deck coating, during which the arc-sprayed Zn coating acted as the interlayer. The effect of the Zn interlayer on microstructures, properties, and fracture behaviors of arc-sprayed Al/AZ91D bimetals by SLCC was investigated and discussed in this study. The optimal process parameter was acquired by analyzing the results from different combinations between the arc-spraying time of the Zn coating (10, 18, and 30 s) and the preheat time of the Al/Zn double-deck coating (6 and 12 h). The interfacial microstructures of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer could be approximately divided into two categories: One was mainly composed of (α-Mg + Al5Mg11Zn4) and (α-Al + Mg32(Al, Zn)49) structures, and the other primarily consisted of (α-Mg + Al5Mg11Zn4), (MgZn2 (main) + β-Zn), and (β-Zn (main) + MgZn2) structures. In the interface zone, the (α-Mg + Al5Mg11Zn4) structure was the most abundant structure, and the MgZn2 intermetallic compound had the highest microhardness of 327 HV. When the arc-spraying time of the Zn coating was 30 s and the preheat time of the Al/Zn double-deck coating was 6 h, the shear strength of the arc-sprayed Al/AZ91D bimetal reached 31.73 MPa. Most rupture of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer occurred at the (α-Mg + Al5Mg11Zn4) structure and presented some typical features of brittle fracture.

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Setyana, Lilik, Nugroho Santoso, Bambang Suharnadi, Benidiktus Tulung Prayoga et Wiyadi Wiyadi. « Bonding of Interface Bimetal Aluminum-Bronze for Bimetal Bushing Produced by Solid Liquid Method ». Acta Metallurgica Slovaca 28, n^o 2 (22 juin 2022) : 80–84. http://dx.doi.org/10.36547/ams.28.2.1253.

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Bimetal is a combination of two dissimilar metals that form a metallurgical bond. The manufacture of bimetallic bushing by centrifugal casting has not been widely developed. There is still no recommendation for optimum temperature used in the manufacture. The aim of this research was to determine the first frozen layer temperature of the aluminum when bronze was poured to produce a well-integrated bond interface. The materials used were aluminum and bronze. Molten metal was pouring into the mold alternately. First, aluminum was poured into the mold. Then, bronze was poured gradually to form a bushing aluminum-bronze bimetallic. The temperature variations of the first frozen layer of aluminum were 27º C, 350º C, 400º C, and 450º C when bronze poured. The molten metal was poured with the filling speed of about 0.2 kg/s into a rotating sand mold. The rotational speed of the mold was 350 rpm. The result shows that the bond interface’s width increases as the first frozen layer aluminum temperature increases. As a result, interface wear and hardness are increased compared to the base metal. Hence, centrifugal casting with the first frozen layer aluminum was 450ºC recommended for aluminum-bronze bimetal bushing applications.

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Fathy, N. « Interfacial Microstructure and Bonding Area of Sn-based Alloy-GG25 Gray Iron Bimetallic Material Using Flux, Sn, and Sn-Zn Interlayer Compound Casting ». Engineering, Technology & ; Applied Science Research 12, n^o 2 (9 avril 2022) : 8416–20. http://dx.doi.org/10.48084/etasr.4804.

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A bimetallic casting consisting of GG25 gray iron substrate and Sn-based alloy using the liquid-solid technique has been studied in this paper. Three different pretreatment processes of gray iron surface substrates including flux only, flux and Sn powder, and flux and Sn-8.8% Zn powder eutectic alloy surface treatment were adopted for the aim of improving the quality of tinning, the interfacial structure, and the bonding area of the Sn-based alloy/gray iron bimetallic composite in order to promote the bonding quality of bimetallic castings. Microstructure characterization on the bonding interface was conducted. The novel tinning material for gray cast iron substrate comprising of Sn-8.8% Zn eutectic alloy powder in combination with flux interlayer improved the bonding area, the interfacial bimetal structure, and the shear stress. This improvement is due to the higher interface reaction of Zn with Fe that leads to the formation of a very thin layer of Fe-Zn and Fe-Sn intermetallic phases.

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Karolczuk, Aleksander, Krzysztof Kluger, Mateusz Kowalski, Fabian Żok et Grzegorz Robak. « Residual Stresses in Steel-Titanium Composite Manufactured by Explosive Welding ». Materials Science Forum 726 (août 2012) : 125–32. http://dx.doi.org/10.4028/www.scientific.net/msf.726.125.

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The main aim of the paper is determination of residual stresses in explosively welded steel-titanium bimetal. The analysis considers two bimetallic specimens: before and after the heat treatment. In residual stress determination the hole drilling method along with finite element analysis were applied. The results show different residual stress states depending on the heat treatment. The obtained results are confirmed by thermal stress calculation.

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Xing, Zhen-Guo, Li-Xin He, Shun-Xing Liang, Lian-Bo Chang, Zhi-Xia Xiao, Wan-Li Xing, Hai-Bin Shen, Jing-Jing Cao et Hong-Ji Liu. « Process Optimization of Dual-Liquid Casting and Interfacial Strength–Toughness of the Produced LAS/HCCI Bimetal ». Materials 16, n^o 5 (28 février 2023) : 2008. http://dx.doi.org/10.3390/ma16052008.

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The pouring time interval is the decisive factor of dual-liquid casting for bimetallic productions. Traditionally, the pouring time interval is fully determined by the operator’s experience and on-site observation. Thus, the quality of bimetallic castings is unstable. In this work, the pouring time interval of dual-liquid casting for producing low alloy steel/high chromium cast iron (LAS/HCCI) bimetallic hammerheads is optimized via theoretical simulation and experimental verification. The relevancies of interfacial width and bonding strength to pouring time interval are, respectively, established. The results of bonding stress and interfacial microstructure indicate that 40 s is the optimum pouring time interval. The effects of interfacial protective agent on interfacial strength–toughness are also investigated. The addition of the interfacial protective agent yields an increase of 41.5% in interfacial bonding strength and 15.6% in toughness. The optimum dual-liquid casting process is used to produce LAS/HCCI bimetallic hammerheads. Samples cut from these hammerheads show excellent strength–toughness (1188 Mpa for bonding strength and 17 J/cm2 for toughness). The findings could be a reference for dual-liquid casting technology. They are also helpful for understanding the formation theory of the bimetal interface.

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Hu, Qingxian, Xiaoli Wang, Xinwang Shen et Zemin Tan. « Microstructure and Corrosion Resistance in Bimetal Materials of Q345 and 308 Steel Wire-Arc Additive Manufacturing ». Crystals 11, n^o 11 (17 novembre 2021) : 1401. http://dx.doi.org/10.3390/cryst11111401.

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The microstructure and corrosion resistance of samples fabricated by Q345 and 308 bimetallic feedings using two kinds of processes of wire-arc additive manufacturing (WAAM) was observed and compared with that of sample manufactured by a single feeding wire of Q345 or 308. The results show that the interface between the Q345 and 308 had no defects and metallurgical bonding. The hardness of bimetal Q345/308 additive manufacturing samples was higher than that of Q345 or 308 single wire additive manufacturing. The sample made of Q345 single wire had serious electrochemical corrosion, while the sample made of 308 single wire had pitting corrosion. The pitting corrosion of the sample reinforced by bimetal Q345/308 feeding wires was improved.

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Wąsek, Seweryn, Sebastian Mróz, Grzegorz Stradomski et Konrad Błażej Laber. « The Analysis of Al-Cu Bimetallic Bars Bond Layers Joined by the Explosive Method ». Solid State Phenomena 199 (mars 2013) : 508–13. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.508.

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The paper presents investigation results for obtaining a semi-finished product in the form of round Al-Cu bimetallic bars by the explosion method. The systems and technological parameters of explosion welding were selected in such a manner as to obtain finished bimetallic bars of an outer diameter of approx. 22 mm and a copper area fraction of the bimetal cross-section of approx. 15 and 30%. In this work was made an analysis of microstructure changes and the microhardness distribution on the cross-sections of the stock materials. There were also made tests of layers connections quality by determining the maximum shear stress on the joint boundary. The results show that the explosive cladding method guarantee a permanent connection of copper layers and aluminum core.

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Adekoya, Joseph Adeyemi, Enock Olugbenga Dare, Michael Adediran Mesubi et Neerish Revaprasadu. « Synthesis and Characterization of Optically Active Fractal Seed Mediated Silver Nickel Bimetallic Nanoparticles ». Journal of Materials 2014 (11 mars 2014) : 1–9. http://dx.doi.org/10.1155/2014/184216.

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The synthesis of new seed mediated AgNi allied bimetallic nanocomposites was successfully carried out by the successive reduction of the metal ions in diethylene glycol, ethylene glycol, glycerol, and pentaerythritol solutions, with concomitant precipitation of Ag/Ni bimetal sols. The optical measurement revealed the existence of distinct band edge with surface plasmon resonance (SPR) in the region of 400–425 nm and excitonic emission with maximum peak at 382 nm which were reminiscent of cluster-in-cluster surface enriched bimetallic silver-nickel sols. The morphological characterization by transmission electron microscopy, high resolution transmission electron microscopy, and X-ray diffraction analyses complimented by surface scan using X-ray photoelectron spectroscopy strongly supported the formation of intimately alloyed face-centered silver/nickel nanoclusters.

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Articles de revues sur le sujet « Bimetallo »

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