Journal articles: 'Multilayer composite'

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Aydaraliev, Zh, M. Abdiev, and Yu Ismanov. "Two-layer Composite Reinforced With Basalt Fibers of Various Lengths." Bulletin of Science and Practice 6, no. 5 (May 15, 2020): 12–20. http://dx.doi.org/10.33619/2414-2948/54/01.

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The article considers the issues of creating composites using long, continuous structures along the entire length of the structure, and short basalt fibers, and, based on them, multilayer composite materials as reinforcement. A mathematical description of the strength properties of multilayer composite materials based on layers of composites using long, continuous along the entire length of the structure, and short basalt fibers as reinforcement is considered. The results of theoretical studies showed that the multilayer composite material has improved properties. The first layer of material, which is a layer of reinforcement made of continuous fibers, provides tensile and bending strength. The second layer of composite material provides thermal insulation properties and compressive and deformation strength. This layer consists of a composite whose reinforcement is short fibers. It is shown that a multilayer composite material, which is a combination of composites created on the basis of long continuous and short fibers, works as a single system. The first layer of the composite, created on the basis of continuous fibers, works in tension and bending, the second layer, created on the basis of short fibers, determines the strength characteristics during compression and deformation. In order to confirm the theoretical results, work was carried out to create composites based on long and short basalt fibers. When creating a layered composite, a heat-insulating plate was used as the first component, which was reinforced with pieces of basalt fiber. For the production of such plates, a plant was developed to obtain pieces of basalt fiber and further uniform distribution of these pieces in a composite plate. A multilayer composite material with improved properties based on long and short basalt fibers is obtained. The composite slab was reinforced with a mesh assembled from continuous basalt fibers.

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Taylor, Caitlin A., Eric Lang, Paul G. Kotula, Ronald Goeke, Clark S. Snow, Yongqiang Wang, and Khalid Hattar. "Helium Bubbles and Blistering in a Nanolayered Metal/Hydride Composite." Materials 14, no. 18 (September 18, 2021): 5393. http://dx.doi.org/10.3390/ma14185393.

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Helium is insoluble in most metals and precipitates out to form nanoscale bubbles when the concentration is greater than 1 at.%, which can alter the material properties. Introducing controlled defects such as multilayer interfaces may offer some level of helium bubble management. This study investigates the effects of multilayered composites on helium behavior in ion-implanted, multilayered ErD2/Mo thin film composites. Following in-situ and ex-situ helium implantation, scanning and transmission electron microscopy showed the development of spherical helium bubbles within the matrix, but primarily at the layer interfaces. Bubble linkage and surface blistering is observed after high fluence ex-situ helium implantation. These results show the ability of metallic multilayers to alter helium bubble distributions even in the presence of a hydride layer, increasing the lifetime of materials in helium environments.

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Wang, Yufei, Shuangle Zhang, Zefeng Wu, Yong Fan, Huaqiang Chen, Qingning Meng, Yang Yan, Zhaoyi Hu, Jing Wang, and Engang Fu. "Design and Preparation of Nanoporous Cu/Ag Multilayer Films." Coatings 11, no. 10 (September 29, 2021): 1187. http://dx.doi.org/10.3390/coatings11101187.

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Cu30Al70 and Ag30Al70 multilayer precursor films were prepared by magnetron sputtering, respectively. Then the nanoporous Cu/Ag multilayer composite films were successfully prepared by selecting the appropriate H2SO4 solution as the dealloying solution. It was found that the nanoporous structure was stable in the dealloying solution. The morphology and structure of nanoporous multilayer films are mainly related to the phase composition of precursors. The structure of nanoporous multilayers can be simply regarded as the superposition of single-layer structures. Our work shows that nanoporous multilayers can be well-prepared by magnetron sputtering combined with dealloying.

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Cho, Ki-Hyun, and Youngman Kim. "Elastic modulus measurement of multilayer metallic thin films." Journal of Materials Research 14, no. 5 (May 1999): 1996–2001. http://dx.doi.org/10.1557/jmr.1999.0269.

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Two- and three-layer composite models were developed using a beam vibration theory, and the models were applied for measuring Young's moduli of thin metallic films. The Cr, Ni, and Co-coated Si wafer composites (two-layer composite) and (Cr/Ti/Si) composites (three-layer composite) were produced by radio-frequency (rf) magnetron sputtering and used to test the developed models. Young's moduli of (Cr) films obtained by the three-layer composite model agree well with those of (Cr) films obtained by the two-layer composite model, considering (Ti/Si) as the one layer and (Cr) as the other layer. This suggests that moduli of multilayer films may be obtained by using a two-layer composite model repeatedly.

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Syifa, Naila Hilmiyana, Agus Yulianto, and Upik Nurbaiti. "Pembuatan dan Karakterisasi Sifat Fisis Komposit Multilayer Serat Rami." Jurnal Pendidikan Fisika dan Teknologi 7, no. 2 (October 23, 2021): 87–95. http://dx.doi.org/10.29303/jpft.v7i2.2783.

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The use of composites as an innovative new material is increasing. Composites are made from two or more materials that have different properties. This research was conducted to make multilayer composites and determine the effect of variations in the number of arrangements and the direction of the fiber angles on the physical properties of composites made from ramie fiber and epoxy. The physical properties of the composites analyzed in this study were density, porosity, water absorption, and thickness expansion. The composites in this study were made using the hand layup method with a volume fraction ratio of 30% and the ratio of epoxy and hardener was 2: 1. Before the composite was made, ramie fibers were soaked in 5% NaOH for 2 hours. This study succeeded in making epoxy ramie multilayer composites with variations in the number of arrangements and the direction of the fiber angles. Variations in the number of layers and the direction angle of the ramie fiber in the composite affect the density and porosity of the composite. Variations in the direction of the ramie fiber in the composite affect the water absorption of the composite. Variations in the number and direction of ramie fiber in the composite did not significantly affect the thickness of the composite.

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Thompson, Delton R., and Xiaohe Liu. "Sound absorptive multilayer composite." Journal of the Acoustical Society of America 124, no. 4 (2008): 1901. http://dx.doi.org/10.1121/1.3001082.

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Zhao, Dong Lin, Jing Wei Hou, Hai Long Zhang, and Zeng Min Shen. "Preparation and Microwave Absorbing Property of Microwave Absorbers with FSS Embedded in Multilayer Composites." Advanced Materials Research 11-12 (February 2006): 501–4. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.501.

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In this paper, we present the experimental results of microwave absorbing materials with a frequency-selective surface (FSS) embedded in the multilayer structural composites. Microwave absorbing materials with the FSS pattern embedded in multilayer structural epoxy resin matrix composites were fabricated. The effects of the FSS on multilayer structural composites for microwave absorbing material design have been investigated. Comparisons were made with the microwave absorptions of the multilayer composites with FSSs of different positions in composites. The microwave absorption properties of the multiplayer composites samples with FSSs are higher than those of the samples without FSSs. The experiment results show that the incorporation of a FSS can effectively change the reflection property of the composite.

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Rovensky, Tibor, Alena Pietrikova, Igor Vehec, and Martin Kmec. "Influence of various multilayer LTCC systems on dielectric properties’ stability in GHz frequency range." Microelectronics International 33, no. 3 (August 1, 2016): 136–40. http://dx.doi.org/10.1108/mi-03-2016-0028.

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Purpose The purpose of this paper is to create multilayer substrate (composite) from various low temperature co-fired ceramic (LTCC) substrates by their mutual combinations and to analyse influence of these multilayer substrates on dielectric properties in GHz frequency range. Design/methodology/approach GreenTape 951, GreenTape 9K7 and Murata LFC were used to create compound multilayer substrates that include three layers: middle layer is from Murata LFC, and both upper and bottom layers are either from GreenTape 951 or GreenTape 9K7. Shrinkage in all x-, y- and z-axes of all substrates including multilayer substrates were analysed, and influence of different shrinkage on dielectric properties was examined by microstrip ring resonators applied on all mentioned of substrates. Findings The middle layer of Murata LFC has significant influence on shrinkage value of composites which has a good repeatability and minimalizes problems with design of multilayer LTCC devices. Impact of middle layer from Murata LFC on dielectric constant is not significant, but on the other hand Q factor (loss tangent) of these composites is increased according to inhomogeneity between single LTCC layers, especially at frequency around 6 GHz. Originality/value The novelty of this work lies in creating multilayers systems from different types of LTCC substrates to find combination with the most suitable physical and dielectric properties for various purposes in GHz range applications.

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Ma, Limei. "Auxiliary Fiber Art Creation Design Based on Conductive Fiber Textile Wireless Structure Sensor." Journal of Sensors 2021 (October 29, 2021): 1–10. http://dx.doi.org/10.1155/2021/3573702.

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The integration of fiber materials into modern pottery creation is an attempt to explore its boundaries as a specific material and art form. Fiber materials, such as fabric and paper, are not resistant to high temperatures, and the clay attached to them can retain the surface texture, texture, and original three-dimensional form of the fiber materials intact during the kiln firing process, making up for the defects of single material molding and maintaining the visual effect of ultrathin and highly translucent works. The light source inside the work is more conducive to creating a specific artistic atmosphere. The purpose of this paper is to explore how fiber materials become the basis of ceramic works and the source of decorative expression, so that this expression and process can be systematically analyzed and interpreted in the application of ceramic art creation. Along with the rapid development of nanotechnology, electronics, and optical technology, people’s clothing fabrics have been increasing in demand in terms of function and appearance. This paper focuses on the research and development of fiber textiles from the field of science and technology and discusses the current status of fiber textiles and the possibility of combining fiber art with science and technology. In this paper, wood cellulose-multiwalled carbon nanotube/wood cellulose composite films were prepared, as well as wood cellulose films and wood cellulose/multiwalled carbon nanotube composite films. The optimal reaction time for the preparation of the films was 2 h, and the optimal reaction temperature was 70°C. Experimental results show that the dispersibility of multilayer carbon nanotubes in wood cellulose multilayer carbon nanotubes/wood cellulose composite films in wood cellulose multilayer carbon nanotubes composite films is superior. If the amount of multilayered carbon nanotubes was 3 wt%, the fracture point extension and accessibility of the wood cellulose multilayer carbon nanotubes/wood cellulose composite film are 12.2% and 106.7 MPa, respectively. It is 93.7%, respectively. 10.7% is higher than wood cellulose/multilayered carbon nanotube composite films.

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Prasob, P. A. "Projectile Penetrating Multilayer Composite Armor." Indian Journal of Science and Technology 9, no. 1 (January 20, 2016): 1–7. http://dx.doi.org/10.17485/ijst/2016/v9i47/107923.

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11

Golov, Anton V., Leonid N. Kotov, Vladimir S. Vlasov, Fanur F. Asadullin, Yuriy E. Kalinin, and Alexander V. Sitnikov. "Concentration Dependences of Exchange Fields in Composite and Multilayer Thin Films." Solid State Phenomena 233-234 (July 2015): 485–89. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.485.

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Monolayer composite, multilayer composite-composite and multilayer composite-semiconductor films were investigated. Dependencies of the internal exchange fields on magnetic metal alloy concentration in nanostructured single and multilayer films at room and liquid nitrogen temperatures were obtained. The calculation is made on the basis of the experimental data and the relationship of the exchange interaction and the broadening of the FMR line.

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12

Tian, Jun, and Zi Qiong Shi. "PVD Preparation Process of (TiN + CrN) / CrAlN Superhard Nanocomposite Multilayer Coatings." Advanced Materials Research 568 (September 2012): 368–71. http://dx.doi.org/10.4028/www.scientific.net/amr.568.368.

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In this study, multi-source multi-target evaporation-sputtering PVD technology to prepare (TiN + CrN) / CrAlN nanocomposite multilayers, accurate modulation of the composition and structure of the coating can effectively reduce the stress in the coating in order to achieve (TiN + CrN) / CrAlN nano-composite multilayer dielectric films optimized design, to reach a good overall performance. (TiN + CrN) / CrAlN superhard nanocomposite multilayer coatings on the surface of tools and molds with carbide and high-speed tool steel materials, followed by the TiN film; (TiN + CrN) film, in the TiN relative content in the layer accounted for 55-65% , CrN relative content for 35-45%; gradient (CrxAl1-x) N-film, x = 0-0.5; structure of TiN / (TiN + CrN) / CrAlN superhardnano-composite multi-layer coating.

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13

Dhar, Aritra, and T. L. Alford. "Effect of Silver thickness and Annealing on Optical and Electrical Properties of Nb2O5/Ag/Nb2O5 Multilayers as Transparent Composite Electrode on Flexible Substrate." MRS Proceedings 1552 (2013): 101–6. http://dx.doi.org/10.1557/opl.2013.641.

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ABSTRACTMultilayer structures of Nb2O5/Ag/Nb2O5 have been deposited onto flexible substrates by sputtering at room temperature to develop indium free composite transparent conductive electrodes. The optical and electrical properties of the multilayers are measured by UV–Visible spectroscopy, Hall measurement and four point probe and the effect of Ag thickness has been studied. The critical thickness of Ag to form a continuous conducting layer is found to be 9.5 nm and the multilayer stack has been optimized to obtain a sheet resistance of 7.2 Ω/sq and an average optical transmittance of 86 % at 550 nm. The Haacke figure of merit (FOM) has been calculated for the films, and the multilayer with 9.5 nm thick Ag layer has the highest FOM with 31.5 x 10-3 Ω/sq, which is one of the best FOM reported till date for room temperature deposition on flexible substrates. The multilayered samples are annealed in vacuum, forming gas, air and O2 environments and the optical and electrical properties are compared against the as-deposited samples.

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14

Qian, Zheng Hua, Feng Jin, Zi Kun Wang, and Kikuo Kishimoto. "The Horizontally Polarized Shear Waves in Multilayered Piezo-Composites with 2-2 Connectivity." Key Engineering Materials 261-263 (April 2004): 465–70. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.465.

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Following the advances in structural applications, composite structures are being used commonly in transducer applications to improve acoustic, mechanical and electrical performance of piezoelectric devices. Functional composite transducers for sensors and actuators generally consist of ceramics and polymers, the disadvantage of the brittleness nature of the piezoelectric ceramics can be overcome and the structures especially good for sensing can be allowed for building up. Propagation behavior of horizontally polarized shear waves (SH-waves) in piezoelectric ceramic-polymer composites with 2-2 connectivity is taken into account. The multilayer structures are consisted of piezoelectric thin films bonded perfectly with polymeric thin films alternately. The phase velocity equations of SH-waves propagation in the piezoelectric ceramic-polymer composites with 2-2 connectivity are obtained for the cases of wave propagation in the direction perpendicular to the layering and along the layering, respectively. Filter effect of this kind of structure and the effect of volume fraction and shear modulus ratio of piezoelectric layer to polymer layer on the phase velocity are discussed in detail, respectively. One practical combination of piezoelectric thin film-polymer thin film multilayer system is chosen to carry out the numerical simulation, some basic properties of SH-waves propagation in above multilayered structures are revealed.

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Song, Bo. "Study on Dielectric and Thermal Properties of ABS / multilayer graphene Composites." Journal of Physics: Conference Series 2247, no. 1 (April 1, 2022): 012011. http://dx.doi.org/10.1088/1742-6596/2247/1/012011.

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Abstract ABS / multilayer graphene (MLGN) composites were prepared by melt blending ABS and multilayer graphene masterbatch,and their dielectric and thermal properties were studied. The results show that the dielectric constant, dielectric loss, conductivity, thermal decomposition temperature and thermal conductivity of ABS / MLGN composites increase with the increase of MLGN content. The content of MLGN in ABS / MLGN composites with conductive percolation is between 7-8%. When the mass content of MLGN increased to 7%, the dielectric constant of the composite increased from 3.01 to 103.23, the dielectric loss increased from 0.058 to 0.83 at 100Hz, the 5% mass loss temperature of the composite increased by 17.0°C and the thermal conductivity increased by 1.9 times. The research results can provide reference for the preparation of thermally conductive polymer dielectric composites.

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Cvijović‐Alagić, Ivana, Vesna Maksimović, and Milan T. Jovanović. "Fractographic analysis of the aluminum matrix composite prepared by accumulative roll bonding." Metallurgical and Materials Engineering 26, no. 4 (November 12, 2020): 349–55. http://dx.doi.org/10.30544/569.

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Recent research in the material science field is focused on the easy-to-apply and cost-effective production of the structural components with enhanced mechanical properties. As an answer to these new trends in the present study, the inexpensive household aluminum foils are used to produce the multilayer aluminum matrix composite. The aluminum matrix composites are manufactured by hot-rolling of the sandwiched foils and afterward subjected to microstructural characterization and mechanical testing. Analysis of the produced composite microstructure and fracture surface obtained after tensile testing was performed using the scanning electron microscopy (SEM). The qualitative fractographic analysis revealed that the ductile fracture features prevail in the overall fracture mode of the investigated multilayer composite, while the quantitative fractographic investigation allowed more detailed insight into the composite failure process and depicted critical parameters that led to the composite failure.

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Rao, Ananda M., Ch Ratnam, J. Srinivas, and A. Premkumar. "Optimum design of multilayer composite plates using simulated annealing." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 216, no. 3 (July 1, 2002): 193–97. http://dx.doi.org/10.1177/146442070221600304.

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This paper proposes the use of a simulated annealing (SA) approach to the optimal design of multilayered composite plate structures. The orientation fibres and the number of layers in laminated composites play a major role in determining strength and stiffness. Therefore, the basic design problem is to determine the optimum stacking sequence of the composite laminate. The SA technique is employed to obtain the optimum fibre orientation of multilayered composite plates, so as to maximize fundamental natural frequency. The composite plate is discretized and analysed by a finite element (FE) analysis procedure using a computer program written in C language. The inverse iteration method is employed to obtain the fundamental frequency of a laminated plate with a given number of layers and fibre orientations in each layer. Both symmetric and antisymmetric fibre angles are considered. The optimum results of fibre orientations are compared with the conventional random walk (RW) method.

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Chekrygina, Ju, A. Devizenko, Y. Kalinin, S. Kirov, E. Lebedeva, I. Shipkova, A. Sitnikov, N. Syr’ev, and S. Vyzulin. "Magnetic and Magnetoresonance Properties of Multilayered Systems Based on (CoFeB)_x-(SiO₂)_100-x Composite Layers." Solid State Phenomena 215 (April 2014): 272–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.272.

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Magnetic properties and ferromagnetic resonance data of (Co41Fe39B20)x-(SiO2)100-x composite films and multilayer structures composed of these films separated by SiC interlayers have been studied. It has been shown that one of the possible causes responsible for the differences of magnetic properties of composites and multilayer structures can be different shapes of magnetic particles and granules in these materials.

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Fadda, Sarah, Antonio Mario Locci, and Francesco Delogu. "Modeling of Point Defects Annihilation in Multilayered Cu/Nb Composites under Irradiation." Advances in Materials Science and Engineering 2016 (2016): 1–17. http://dx.doi.org/10.1155/2016/9435431.

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This work focuses on a mathematical modeling of the response to irradiation of a multilayer composite material. Nonstationary balance equations are utilized to account for production, recombination, transport, and annihilation, or removal, of vacancies and interstitials at interfaces. Although the model developed has general validity, Cu/Nb multilayers are used as case study. Layer thickness, temperature, radiation intensity, and surface recombination coefficients were varied systematically to investigate their effect on point defect annihilation processes at interfaces. It is shown that point defect annihilation at interfaces mostly depends on point defect diffusion. The ability of interfaces to remove point defects can be described by a simple map constructed using only two dimensionless parameters, which provides a general tool to estimate the efficiency of vacancy and interstitial removal in multilayer composite materials.

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Gubanova, Galina N., Valentina A. Petrova, Svetlana V. Kononova, Elena N. Popova, Valentina E. Smirnova, Alexander N. Bugrov, Vera V. Klechkovskaya, and Yury A. Skorik. "Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides." Biomolecules 11, no. 5 (May 19, 2021): 762. http://dx.doi.org/10.3390/biom11050762.

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This study investigates the thermal and structural properties of multilayer composites based on chitosan (CS) and polyanions with different functionalities, including sodium sulfoethyl cellulose (SEC), sodium alginate (ALG), and sodium hyaluronate (HA). Unlike polyelectrolyte complexes (PECs) obtained by polymer mixing, the formation of a PEC layer by a process of layer-by-layer deposition of oppositely charged polymers is accompanied by the transformation of the CS polymorphic state, and this affects the relaxation and thermal properties of the resulting multilayer composite. X-ray diffraction analysis showed that the formation of the PEC layer in the CS/SEC multilayer film is accompanied by crystallization of the CS chains and the formation of a predominantly anhydrous CS modification. Thermogravimetric analysis of the CS/SEC film registers a high-temperature peak associated with the thermal decomposition of crystalline CS in the PEC composition. According to the dynamic mechanical analysis, the CS/SEC composite was characterized by a single glass transition temperature, indicating a strong interaction between the layers when using SEC (a strong acid salt) as the counterion to CS. For multilayer composites with weak polyacid salts (ALG and HA), the crystallization of CS in the PEC layer is weaker, as reflected in the thermal degradation of these films. A high-temperature peak is recorded in the thermal decomposition of CS/HA and is absent in the case of CS/ALG. Dynamic mechanical analysis of the CS/ALG composite showed two glass transition temperatures close to those of the original polymers, indicating weak PEC formation. The CS/HA composite showed an intermediate response. Thus, the effect of the PEC layer on the properties of the poly-layer composites decreases in the order CS/SEC > CS/HA > CS/ALG.

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Zhang, Yanzhong, T. B. Bini, Zheng Ming Huang, and S. Ramakrishna. "Fracture Characteristics of Knitted Fabric Composites under Tensile Load." Advanced Composites Letters 9, no. 2 (March 2000): 096369350000900. http://dx.doi.org/10.1177/096369350000900205.

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This paper reports tensile properties of single layer and multilayer knitted glass fabric reinforced epoxy composites. The single layer composite was subjected to tensile load in off-axis angles of 0°, 30°, 45°, 60° and 90°. The multilayer laminates stacked as configurations of [0°]4, [07±4570°], [0°/90°/90°/0°] and [90°]4 were tested under a uniaxial tensile load. Emphasis was on the fracture characteristics of these composites. A ‘matrix digestion and layer peeling’ method was used to visualize the fracture modes of all the layers in a fractured laminate on a lamina level. It was found that the fracture mode of an angle-plied lamina in the laminate is different from that of a single layer composite under an off-axial tensile load.

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Zhang, Chao, Wei Wu, and Yong Li. "Numerical Simulation Analysis for Anti-Penetration of Multilayer Ceramic Composite." Advanced Materials Research 396-398 (November 2011): 386–89. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.386.

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Use ANSYS / LS-DYNA software to build a numerical model for studying influence of projectile’s penetration velocity, penetration angle and ceramic/metal composite structure on protective capacity of multilayer ceramic composite. The results showed that velocity loss range of projectile running through the multilayer ceramic composite decreased with initial penetration velocity of projectile increased and that the shape of bullet hole showed growing asymmetry with penetration angle increased. Anti-penetration capacity of multilayer ceramic composite protective structure is better than that of single-layer ceramic composite protective structure or single-layer homogeneous steel structure with equal quality.

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Xu, Li Nan, Shu Chen Tu, Feng Zhu Lv, Qi An, and Yi He Zhang. "Preparation of CPC-Fe₃O₄-MMT/PEG Magnetic Films via Layer-by-Layer Assembly under the Assistance of Magnetic Field." Materials Science Forum 852 (April 2016): 1034–38. http://dx.doi.org/10.4028/www.scientific.net/msf.852.1034.

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Polyethylene glycol (PEG), which was not a traditional building block of layer by layer (LBL) self-assembly, was used to fabricate multilayer films by the combination of LBL and magnetic field induction. The UV-abs absorbance of the composite films increases linearly with the number of bilayers, indicating uniform fabrication of each layer. By this method, the multilayers can consist of up to 15 bilayers. The applied magnetic field not only enhances the compactness of the CPC-Fe3O4-MMT, but also improves the deposition efficiency of the films. The present method can be an effective method for multilayer film fabrication from non polyelectrolyte.

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Kosciuszko, Artur, Tomasz Sterzynski, and Kazimierz Piszczek. "Multilayer hybrid polypropylene composite with single and wood-polymer composites." Polimery 63, no. 11/12 (November 2018): 755–61. http://dx.doi.org/10.14314/polimery.2018.11.3.

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Sherkatghanad, Ehsan, Li Hui Lang, and Shi Chen Liu. "Multilayer and Fiber Metal Laminate Materials Hydro-Bulging." Materials Science Forum 941 (December 2018): 1996–2005. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1996.

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Advanced materials such as aluminum alloys and composites offer great potential for weight reduction applications in automotive and aerospace vehicles construction. In order to investigate the feasibility of using such materials in the form of laminates, sheet bulging with single-layer aluminum and the aluminum/Composite laminate with the carbon cloth as the middle layer is investigated under uniform liquid pressure conditions. The aluminum sheet stress-strain, wall thickness distribution, carbon fiber radius stress-strain distribution and the effect of die entrance radius etc. are discussed and compared in details. FE results validate that the numerical method can predict the same fracture regions for bulging-blank as observed in experimental tests. Furthermore, the study validates that multi-layer sheet hydro-bulging process with composite fiber as a middle layer is not feasible to form laminates due to rupture of composite fibers near edge regions. Further study is needed to improve the methodology.

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Spinacé, Márcia AS, and Marco-Aurelio De Paoli. "Biocomposite of a multilayer film scrap and curauá fibers." Journal of Thermoplastic Composite Materials 30, no. 2 (August 5, 2016): 225–40. http://dx.doi.org/10.1177/0892705715598358.

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An important material for making composites is the scrap of multilayer films. Using plant fibers in these composites can further contribute to reduce their environmental impact. We prepared, by extrusion and injection molding, composites of this scrap reinforced with 20 wt% of curauá fibers. These were characterized using scanning electron microscopy (SEM); optical microscopy; tensile, flexural, and notched impact strength tests; differential scanning calorimetry; carbonyl index (CI) by Fourier transform infrared spectroscopy; reflectance ultraviolet–visible spectroscopy; and water absorption measurements. The fiber promoted an increase in the flexural and tensile moduli strengths. SEM showed good fiber/matrix adhesion, dispersion of the fibers in the matrix and their fibrillation. Weathering of the surface of the composite during environmental aging was evidenced by CI, degree of crystallinity, melting temperature, and the formation of cracks caused by chemi-crystallization. Despite the environmental degradation of the exposed composite surface, the mechanical properties and interfacial adhesion did not change significantly.

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Wu, Gui Long, Long Liu, Xiao Zong, Yan He, and Ze Peng Wang. "Study on Thermal Conductivity of Multilayer Graphene/NR Composite." Advanced Materials Research 933 (May 2014): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.933.3.

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Graphene/NR composite was prepared in emulsion blending and the multilayer graphene was about 4-8 layers. Different mass fraction of this kind of graphene was mixed into NR in this work.The thermal conductivity of this compositive system was respected to be improved apparently since the high thermal conductivity of graphene. In this work, TEM(Transmission electron microscope) was used to observe the structure and morphology of the multilayer graphene. NETZSCH LFA was used to research the change of thermal conductivity with the fraction of grahene changing. DSC(differential scanning calorimetry) was used to research the structure change in the series of composites. The TEM results showed that the graphene we used is 4-5 layers. LFA had proved that the multilayer graphene has affected the thermal conductivity of matrix greatly and DSC also provided evidence to support the same views.

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Ushakov, Ivan V., and Ayur D. Oshorov. "Viscosity of Microdestruction of Multilayer Composite and Method of its Revealing." Materials Science Forum 1052 (February 3, 2022): 110–15. http://dx.doi.org/10.4028/p-5q4060.

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A technique for creating multilayer composites has been developed. Mechanical properties of two-layer composites without carbon nanotubes and with carbon nanotubes were carried out by the method of local loading. The dependences of microhardness on the magnitude of the load and the depth of indentation were determined. An equation for determining the coefficient of microdestruction viscosity for two-layer composite material has been developed.

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Wei, Z., L. H. Yam, and L. Cheng. "Delamination Assessment of Multilayer Composite Plates Using Model-based Neural Networks." Journal of Vibration and Control 11, no. 5 (May 2005): 607–25. http://dx.doi.org/10.1177/1077546305052317.

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A procedure for damage detection in multilayer composites is described using model-based neural networks and vibration response measurement. The appropriate finite element model is established to generate the training data of neural networks. Internal delaminations with different sizes and locations are considered as the particular damage scenarios in multilayer composite plates. The damage-induced energy variation of response signal is investigated, and the mechanism of mode-dependent energy dissipation of composite plates due to delamination is revealed. In order to obtain the structural dynamic response of the samples, impulse forced vibration testing is conducted using a piezoelectric patch actuator and an accelerometer. To enhance the sensitivity of damage features in the vibrating plate, the damage-induced energy variation of the response signal decomposed by wavelet packets is used as the input data of backward propagation neural networks for the prediction of delamination size and location. The test results show that the proposed method is effective for the assessment of delamination status in composites.

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Yao, Yi Yong, Li Ping Zhao, Sheng Hu, and Wen Jie Bai. "Damage Analysis for Multilayer Composite Material." Advanced Materials Research 912-914 (April 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.3.

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After studying the influencing factors and interaction rules of the damage for reinforced carbon fiber in different jet medium on the basis of analyzing carbon fiber damage for traditional acupuncture process, a lower damage process scheme of preform based on jet for layered carbon fiber composite is proposed in this paper. Firstly, the carbon fiber puncture damage is clustered and formal described by using graph theory, which the analytical method for a complex combination of puncture damage is obtained successfully. Then the stress and strain distribution of carbon fiber puncture damage is analyzed through simulation. So this paper has proposed a new technical approach for improving the quality of the needle perform.

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Radchenko, Alexander K., and Tamara K. Gogaeva. "Multilayer Steel Composite Prepared by Rolling." Powder Metallurgy and Metal Ceramics 42, no. 7/8 (July 2003): 336–40. http://dx.doi.org/10.1023/b:pmmc.0000004152.75232.34.

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Mushailov, É. S., P. D. Kim, I. A. Turpanov, G. V. Bondarenko, G. N. Bondarenko, and S. É. Mishina. "Multilayer composite epitaxial CuCo single crystals." Journal of Experimental and Theoretical Physics Letters 71, no. 5 (March 2000): 195–97. http://dx.doi.org/10.1134/1.568313.

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Gebretsadik, D. W., J. Hardell, I. Efeoğlu, and B. Prakash. "Tribological properties of composite multilayer coating." Tribology - Materials, Surfaces & Interfaces 5, no. 3 (September 2011): 100–106. http://dx.doi.org/10.1179/1751584x11y.0000000015.

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Kangwen Yang, Xuewei Ba, Jiang Li, Yubai Pan, and Heping Zeng. "Multilayer YAG/Yb:YAG Composite Ceramic Laser." IEEE Journal of Selected Topics in Quantum Electronics 21, no. 1 (January 2015): 168–72. http://dx.doi.org/10.1109/jstqe.2014.2365576.

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Jeong, Soon Jong, Eon Cheol Park, Dae Su Lee, Min Soo Kim, Jae Sung Song, and Gon Seung Yang. "Piezoelectric Composite and its Multilayer Actuator." Materials Science Forum 539-543 (March 2007): 3237–42. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3237.

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Eremina, N. A., and A. A. Baryakh. "Elastoplastic deformation of a multilayer composite." Mechanics of Composite Materials 30, no. 6 (1995): 519–23. http://dx.doi.org/10.1007/bf00821267.

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Naidu, M. K., K. Ramji, B. V. S. R. N. Santhosi, TC Shami, Himangshu B. Baskey, and B. Satyanarayana. "Enhanced Microwave Absorption of Quartic Layered Epoxy-Mwcnt Composite for Radar Applications." Advanced Composites Letters 26, no. 4 (July 2017): 096369351702600. http://dx.doi.org/10.1177/096369351702600405.

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In this paper we presented the electromagnetic analysis of multilayered Radar Absorbing Structure (RAS) composed of Multi-Wall Carbon Nano Tubes (MWCNTs) with different weight percentages. The complex permittivity and permeability of MWCNT/epoxy composites with different wt% are analysed and the microwave absorbing characteristics are evaluated. The permittivity and permeability of MWCNT composites increased with increase in MWCNT concentration. Absorption properties like reflection loss of multilayered RAS are estimated analytically using electromagnetic wave theory for different layers and with different layer order based on impedance matching condition. The quartic layer MWCNT/epoxy composite achieves a better microwave absorption when compared to other multilayer RAS. The microwave absorption was attributed to dielectric loss of the material. The simulated quartic layer RAS is fabricated and validation of reflection loss is done experimentally using free space measurement technique. From free space measurement the minimum reflection loss in entire X-band is observed to be approximately −12 dB (95% of absorption), −15 dB (97% of absorption), with 3 GHz band width, −20 dB (99% of absorption) with 2 GHz bandwidth and maximum peak of - 44 dB at 11.5 GHz. Hence the composite material has great potential of application as highly efficient microwave absorber.

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Weitao, Zhou, Huang Haitao, Du Shan, Huo Yingdong, He Jianxin, and Cui JianxinShizhong. "Layer-by-Layer Structured Membranes of Silk Fibroin and Polyethylenimine on Electrospun Silk Fibroin Nanofibers." Open Materials Science Journal 8, no. 1 (September 29, 2014): 81–86. http://dx.doi.org/10.2174/1874088x01408010081.

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Self-assembled silk fibroin (SF)-polyethylenimine (PEI) multilayered films were fabricated on ethanol treated electrospun SF nanofibrous substrates via the electrostatic layer-by-layer (LBL) adsorption. The film coated membranes were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectrophotometer (XPS). The SEM images showed that the multilayers of SF-PEI were formed on the surface of the ethanol treated SF nanofibres. The characteristics such as the fiber shape and porous structure were well maintained as the number of the coated SF-PEI bilayers was less than five. However, obvious adhesive substances and blocked pores were observed on the surface of the fibers as the number of bilayers of SF-PEI increased to six. Furthermore, the obvious core-shell structures were observed by TEM. The thickness of five SF-PEI bilayers was approximately 80nm. Additionally, the XPS results also revealed that the SF-PEI multilayer composite membranes formed. The adsorption mainly depended on a simple electrostatic interaction between the layers of SF and PEI. These SF-PEI multilayer assembled nanofibrous membranes could be a promising material for use as a sensor, gene delivery agent and scaffolds.

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Wang, Ming Zhi, Liang Sheng Qiu, Liang Hu Cheng, Xiang Liu, Jian Shao, Xin Cao, Tao Sha Song, Han Tao Kou, and Jie Tao. "Fabrication of Al/Ni Multilayer Composite by Electrodeposition and Hot Press Bonding and Investigation of its Bending Property." Key Engineering Materials 793 (January 2019): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.793.3.

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The Al/Ni multilayer composite with highly exothermic reactions and good plasticity was fabricated by electrodeposition and hot press bonding process. The Al/Ni multilayer composite consisted of the microscale Al and Ni layers. The Ni layers were electroplated on Al foils for a certain time and DC current, and then a mounts of deposited foils were stacked and combined as a whole bulk Al/Ni multilayer composite. In this study, the microstructure evolution, phase transformation, exothermic heat and bending property of the Al/Ni multilayer composite during various hot press bonding were studied by SEM, XRD, DSC and bending test. Under the hot press bonding condition of 400°C and 1h, the exothermic heat, the bending strength and the bending displacement reached 916J/g, 614.5MPa and 4mm, respectively. The results showed that by the increasing time of hot press bonding, the bending displacement of the Al/Ni multilayer composite improved firstly and then declined sharply. It was also found that when the time of hot press bonding increased, the bending strength and the exothermic heat decreased simultaneously, owing to the nucleation and growth of the Al3Ni phases in the interfaces between Al and Ni layers.

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Михеев, П. В., С. В. Бухаров, А. К. Лебедев, and С. В. Тащилов. "3D Reinforcement Arrangements for Carbon-Carbon Composite Multilayer Fiber Preforms." Успехи кибернетики / Russian Journal of Cybernetics, no. 3(11) (September 30, 2022): 63–73. http://dx.doi.org/10.51790/2712-9942-2022-3-3-7.

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для повышения эффективности работы энергетических установок нового поколения требуется совершенствование современных многослойных композиционных материалов с регулируемой схемой, плотностью армирования и межслоевой прочностью, гарантирующих устойчивость конструкций к действию высоких уровней термических и эрозионных нагрузок. Для эффективной разработки таких материалов требуется проводить моделирование их структуры с целью прогнозирования характеристик целевого изделия. В данной статье исследовано влияние параметров структуры материала и технологического процесса односторонней прошивки (тафтинга) многослойного пакета заготовки из углеродной ткани УТ-900 жгутом УКН-М-3К-ЭД на свойства композиционных материалов. В статье проводится моделирование технологии изготовления волокнистых преформ прошивкой тканого пакета углеродных тканей толщиной до 100 мм. Такой пакет является заготовкой для изготовления углерод-углеродного композита с требуемым уровнем теплофизических и конструкционных свойств.Опытным путем проведено моделирование структуры прошивки волокнистой заготовки для получения преформ армированного композиционного материала. Свойства материала «Тафтинг», необходимые для моделирования работоспособности конструкций, определены экспериментально и с учетом анизотропии свойств. Полученные результаты сравниваются с материалами КИМФ, Ипресскон, АРМИР-П и МКУ4М-7. to improve the efficiency of advanced powerplants, we need new multilayer composite materials with adjustable layup patterns, reinforcement density, and interlayer strength. They will ensure structural stability under high thermal loads and erosion. The structure of such materials should be modeled to forecast the properties of the final product. This paper studies the effects of composite structure and tufting (inserting a thread through a layered dry fabric with a needle that, after insertion, moves back along the same trajectory) of a multilayer UT-900 carbon fabric composite with the UKN-M-3K-ED thread on the properties of the composite. We simulated the tufting of layered carbon fabrics preforms up to 100 mm thick. These preforms are workpieces for making carbon-carbon composites with the required thermal, physical, and structural properties.We experimentally modeled the tufting of a layered reinforced composite preform structure. The anisotropic tufting process variables required to assess the structural properties were estimated experimentally. The results were compared with the properties of KIMF, Ipresscon, ARMIR-P, and MKU4M-7 composites.

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Zhang, Renji, Ziwei Lin, Zhouping Cui, and Qi Song. "Studies on multilayer wear of CVD TiCTiN multilayer composite coating." Wear 147, no. 2 (July 1991): 227–51. http://dx.doi.org/10.1016/0043-1648(91)90182-t.

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Huang, Jen Ching, and Tsung Ching Lin. "Study on Mechanical Properties of Multilayer Graphene/Epoxy Nanocomposites." Key Engineering Materials 846 (June 2020): 29–34. http://dx.doi.org/10.4028/www.scientific.net/kem.846.29.

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In this paper, the implementation and testing of multilayer graphene/epoxy resin nanocomposites are discussed. Firstly, the epoxy resin hardener is mixed with the multilayer graphene, and then mixed with the main agent, then poured into the mold, and the low temperature cooling system is used. The curing time of the epoxy resin is slowed down, and the bubble is removed before the complete hardening by the vacuum defoaming method, and the mechanical properties such as tensile strength and toughness are compared with the pure epoxy resin after being sufficiently hardened. In this paper, we investigated the effect of multilayer graphene content on mechanical properties by using the tensile test and impact test. We discussed the effect of multilayer graphene content on the coefficient of elasticity of the multilayer graphene/epoxy resin composites at different stretching rates. And the toughness of the multilayer graphene/epoxy resin composites was evaluated by impact test. After the experiment, it was found that the stretching rate has a certain degree of influence on the grapheme/epoxy resin composite material. And that the addition of 2% multilayer graphene to epoxy resin had the best effect and could effectively improve the coefficient of elasticity and toughness.

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Zhabin, A. N., D. V. Sidorov, and A. N. Nyafkin. "FIBROUS COMPOSITE MATERIALS WITH A METAL MATRIX (review)." Proceedings of VIAM, no. 6 (2021): 27–35. http://dx.doi.org/10.18577/2307-6046-2021-0-6-27-35.

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The article provides an overview of the literature in the field of composite materials (CM) based on metal matrices reinforced with carbon fibers. The main structural, physical and mechanical properties and morphology of such CMS are briefly described. The structure and properties of new CMS from multilayer metal-intermetallic multilayer laminates reinforced with carbon and ceramic fibers are also presented. Application of the method of ultrasonic consolidation for the manufacture of multilayer fibrous CMs based on metal-intermetallic laminates provides high adhesion of fibers with an intermetallic layer.

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Rudt, Alexander, Tonya D. Andreeva, Rumen Krastev, and Stefka G. Taneva. "Composite polyelectrolyte multilayers for biofunctionalization of medical devices." Current Directions in Biomedical Engineering 6, no. 3 (September 1, 2020): 426–29. http://dx.doi.org/10.1515/cdbme-2020-3110.

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AbstractPolyelectrolyte multilayer coatings (PEM) are prepared by alternative layer-by-layer deposition of cationic and anionic polyelectrolyte monolayers on charged surfaces. The thickness of the coatings ranges from nm to few μm. Their properties such as roughness, stiffness, surface charge and surface energy can be precisely tuned to fulfill different technical or biological requirements. The coating process is based on self-assembly of polyelectrolytes. Advantages of these coatings are their easy handling, no harsh chemistry and the possibility for coatings on complex geometries. The PEM coatings can be prepared from a variety of suitable polyelectrolytes. Their stability varies from very durable PEM coatings that are only soluble in strong solvents to quickly degradable, which may be applied as drug release system. One example of such a degradable PEM system is the one based on the polyelectrolyte pair Hyaluronan (HA) and Chitosan (CHI). These biopolymers originate from natural sources and show low toxicity towards human cells. However, HA/CHI multilayers shows only weak adhesiveness for human umbilical vein endothelial cells (HUVEC). In this article, we summarize our approaches to enhance the HA/CHI multilayer by incorporation of a non-polymer substance -graphene oxide- to improve the cell adhesion and keep such properties as low cytotoxicity and biodegradability. Different approaches for incorporation of graphene oxide were performed and the cellular adhesion was tested by metabolic assay.

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Park, Seongeun, Hoyoun Kim, Yoonkwan Kim, Eunhee Kim, and Yongsok Seo. "Multilayer-Structured Non-leaded Metal/Polymer Composites for Enhanced X-ray Shielding." MRS Advances 3, no. 31 (2018): 1789–97. http://dx.doi.org/10.1557/adv.2018.336.

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AbstractPolymer-non-leaded metal (tin, bismuth-tin (BiSn) alloy, and tungsten) composites were prepared to investigate the effectiveness of their X-ray shielding. Films of the composites were found to exhibit excellent X-ray shielding due to the uniform dispersion of metal particles in the polymer matrix, as were fabrics impregnated with the BiSn alloy. The fabricated composites effectively absorb penetrating photons. The preparation of composites with a uniform dispersion and a multilayered structure can limit the formation of pin holes. Multilayered BiSn composites exhibit significantly enhanced shielding. The lamination of a tungsten composite film or a BiSn composite film onto a BiSn-coated layered sheet results in better and more uniform shielding. Thus non-leaded BiSn metal-polymer composites can be used in X-ray shielding applications instead of the lead. One advantage that metal BiSn has over tungsten is its low melting temperature, which means that it can be processed in a normal extruder or in internal mixers such as those used in polymer processing.

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Umair, Muhammad, Syed Talha Ali Hamdani, Muhammad Ayub Asghar, Tanveer Hussain, Mehmet Karahan, Yasir Nawab, and Mumtaz Ali. "Study of influence of interlocking patterns on the mechanical performance of 3D multilayer woven composites." Journal of Reinforced Plastics and Composites 37, no. 7 (January 10, 2018): 429–40. http://dx.doi.org/10.1177/0731684417751059.

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Three-dimensional multilayer woven composites are mostly used in high-performance applications due to their excellent out-of-plane mechanical performance. The current research presents an experimental investigation on the mechanical behavior of three-dimensional orthogonal layer-to-layer interlock composites. The glass filament yarn and carbon tows were used as reinforcement in warp and weft directions respectively, whereas epoxy was used as a resin for composite fabrication. Three different types of orthogonal layer to layer interlock namely warp, weft, and bi-directional interlock composites were fabricated and the effect of interlocking pattern on their mechanical performance was evaluated. The evaluation of the mechanical performance was made on the basis of tensile strength, impact strength, flexural strength, and dynamic mechanical analysis of composites in warp and weft directions. It was found that warp and weft interlock composites showed better tensile behavior as compared to bi-directional interlock composite both in the warp and weft directions, due to the presence of less crimp as compared to the bi-directional interlock composite. However, the bi-directional interlock composite exhibited considerably superior impact strength and three-point bending strength as compared to the other structures under investigation. These superior properties of bi-directional interlock composites were achieved by interlocking points in warp and weft directions simultaneously, creating a more compact and isotropic structure. Tan delta values of dynamic mechanical analysis results showed that bi-directional interlock composite displayed the highest capacity of energy dissipation in the warp and weft directions while weft interlock structures displayed highest storage and loss moduli in the warp direction.

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Ushakov, Ivan V., and Ayur D. Oshorov. "Physical Patterns of Deformation and Destruction of a Two-Layer Composite Compound Polymer - Nanocrystalline Metal Film under Local Loading by the Vickers Pyramid." Proceedings of the Southwest State University. Series: Engineering and Technologies 11, no. 4 (2021): 95–107. http://dx.doi.org/10.21869/2223-1528-2021-11-4-95-107.

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The purpose. Determination of the mechanical properties of two-layer composites surface coating hard brittle films - elastic polymer, as well as the development of mechanical testing methods. Methods. Mechanical tests of a multilayer composite compounds without carbon nanotubes and reinforced with carbon nanotubes were carried out by the method of local loading. The dependence of microhardness Hv on the magnitude of the load and the depth of indentation is determined. Results. The method of creating multilayer composite compounds is described. The values of microhardness for composite compounds are determined. The specificity of the standard method of mechanical testing for a multilayer composite compound is revealed. Conclusion. The addition of nanotubes to the polymer composite has a weakening effect, which is associated with the formation of nanotube conglomerates, around which pores are formed. It is possible to achieve a growth of strength with an increase in the dispersion of carbon nanotubes. At low loads not exceeding 1 N, the microhardness is determined by the influence of a thin and hard nanocrystalline film. Therefore, the usage of a standard scheme of mechanical tests for loads from 0.5 N to 1 N allows us to define the value of microhardness of thin composite film and polymer. If loads are more than 1.5 N, it is more correctly to say, that we define the value of microhardness of the composite film, polymer and the second nanocrystalline film. If the load increases 1.5-2 N, it is correct say, that we define the microhardness of the composite as a whole. A method for determining the micro-fracture viscosity coefficient of two-layer composite compounds based on determining the total length of cracks on a surface area S, with an imprint from the Vickers pyramid in the center, is proposed.

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Aidaraliev, Zh, Zh Abdykalyk kyzy, Ch Zholdoshova, and A. Suyunbek uulu. "A Building of Energy Keeping Mobile House Based on Basalt Fiber." Bulletin of Science and Practice, no. 9 (September 15, 2022): 423–27. http://dx.doi.org/10.33619/2414-2948/82/47.

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Research relevance: recently production of basalt fiber has become widespread as the basis for various industrial products. The mobile house is effectively used in the Ministry of Emergency Situations, energy conservation, agriculture and livestock. Research objectives: to investigate the deformation properties of basalt networks and basalt composites to obtain a layered system. Creation of multilayer heat-insulating high-strength composite materials based on basalt fiber and modeling of an energy-saving mobile home based on a multilayer composite material. Research materials and methods: the deformation of the basalt mesh depending on temperature was studied in order to strengthen the structure of the composite material. Basalt grids withstood temperatures from 100°С to 400°С for 30 minutes. Research results: prototypes of mobile houses based on a new layered material were prepared. Conclusions: tested basalt-plastic rebars are characterized by brittleness during destruction, depending on the thickness and diameter of the rod.

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Dildin, A. N., V. Yu Gerasimov, and O. V. Zaitseva. "The Structure of Multi-Layer Composite Material Obtained by the Method of Diffusion Welding." Materials Science Forum 946 (February 2019): 139–44. http://dx.doi.org/10.4028/www.scientific.net/msf.946.139.

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Creation of reliable and durable composite materials made of components with different properties is an urgent task. Such materials include multilayered steel. Alternation of a large number of heterogeneous layers leads to a set of properties that are unattainable for homogeneous steel. Production of such composite materials faces many problems. The use of diffusion welding has created a number of composite materials based on steels of different composition, and their properties allow you to use them in the manufacture of cutting tools. The purpose of this work was to study the structure of multilayer composite materials obtained with the help of diffusion welding and the study of the heat treatment effect on the material structure. During the study, the structures of samples of six different composite materials were studied after annealing and after quenching of the metal. The study showed that the studied materials have a pronounced layered structure with a sharp transition boundary from one layer to another. The technology used in the production of composites ensures the actual absence of the transition zone and the absence of such frequent diffusion welding defects as stratifications, pores, oxide inclusions, etc. The study found that during heat treatment process sizes of carbide inclusions in the composite layers decreases, and their number increases.

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Yang, Bo, Zhuoyu Li, Kuanyuan Fan, Baoxi Liu, Wenxing Yu, and Fuxing Yin. "Warm Rolled Temperature Effect on Microstructure and Mechanical Properties of 18Mn/40Si2CrMo Multilayer Composite Steel." Crystals 12, no. 11 (November 17, 2022): 1652. http://dx.doi.org/10.3390/cryst12111652.

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In order to obtain a good strength-plastic/toughness match relationship, 18Mn/40Si2CrMo multilayer composite steels were successfully fabricated by a vacuum hot rolling and warm rolling process in this paper. The effects of different warm rolling temperatures (400–600 °C) on the microstructure and mechanical properties of the multilayer composite steel were systematically investigated. The result shows that the warm rolling process reduces thickness of the interfacial diffusion layer, which improves the interfacial bonding strength of multilayer composite steel. With the increase of warm rolling temperature, the total elongation (TEL) increases but ultimate tensile strength (UTS) decreases. The multilayer composite steel with a warm temperature of 500 °C achieves the balance of strength and plastic of which the UTS and TEL are 1.7 GPa and 12.5%, respectively. This is due to the high work-hardening ability of deformation twins of the 18Mn layer and the precipitates nanoscale carbides of the 40Si2CrMo layer to obscure the dislocation movement.

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Journal articles on the topic 'Multilayer composite'

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