Journal articles: 'Super Plastic Deformation'

1

Ragozin, Alexey, Dmitry Zedgenizov, Vladislav Shatsky, Konstantin Kuper, and Hiroyuki Kagi. "Deformation Features of Super-Deep Diamonds." Minerals 10, no. 1 (December 24, 2019): 18. http://dx.doi.org/10.3390/min10010018.

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The paper presents new data on the internal structure of super-deep (sublithospheric) diamonds from Saõ-Luiz river placers (Brazil) and from alluvial placers of the northeastern Siberian platform (Yakutia). The sublithospheric origin of these diamonds is supported by the presence of mineral inclusions corresponding to associations of the transition zone and lower mantle. The features of morphology and internal structure have been studied by optical and scanning electron microscopy (SEM), cathodoluminescence topography (CL), and electron backscatter diffraction (EBSD) techniques. Diamonds typically have complicated growth histories displaying alternating episodes of growth, dissolution, and post-growth deformation and crushing processes. Most crystals have endured both plastic and brittle deformation during the growth history. Abundant deformation and resorption/growth features suggest a highly dynamic growth environment for super-deep diamonds. High temperatures expected in the transition zone and lower mantle could explain the plastic deformations of super-deep diamonds with low nitrogen content.

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Hao, Y. L., S. J. Li, S. Y. Sun, C. Y. Zheng, Q. M. Hu, and R. Yang. "Super-elastic titanium alloy with unstable plastic deformation." Applied Physics Letters 87, no. 9 (August 29, 2005): 091906. http://dx.doi.org/10.1063/1.2037192.

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Ma, Chao Qun, Qi Qiang Duan, and Xiao Wu Li. "Plastic Deformation and Damage Behavior of AL6XN Super-Austenitic Stainless Steels." Advanced Materials Research 79-82 (August 2009): 1951–54. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1951.

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Tensile and compressive deformation and damage behaviors of Al6XN super-austenitic stainless steels were examined at different strain rates. The deformation and fracture surfaces were characterized by scanning electron microscopy (SEM). It was found that the uniaxial deformation (tensile or compressive) behaviors of Al6XN stainless steel shows a low strain rate sensitivity over the range of 10-4s-1 - 10-2s-1. The tensile and compressive yield strengths measured are nearly comparable. The steel shows a good tensile plasticity. Dislocation slip deformation is the main characteristic of uniaxial deformation. All fracture surfaces induced by tensile deformation at different strain rates can be divided into two parts, i.e., fibrous zone and shear lip zone. The fibrous zone consists of dimples with a bimodal size.

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Sun, Jian Hua, Hai Gu, and Guo Ding Yuan. "Super Plastic Deformation Behavior of the Commonly as-Extruded Mg-3Zn-1Al Magnesium Alloy." Advanced Materials Research 798-799 (September 2013): 79–82. http://dx.doi.org/10.4028/www.scientific.net/amr.798-799.79.

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Super plastic behavior of the commonly as-extruded Mg-3Zn-1Al (ZA31) magnesium alloy is investigated at temperatures ranging from 593 to 623K and strain rates ranging from 8×10-5 to 10-3s-1. The results show that the alloy exhibits excellent super plasticity and the maximum elongation-to-failure reaches 220.4%. The alloy also shows a high strain rate sensitivity exponent of 0.38. Microstructure observations suggest that grain boundary sliding (GBS) with cavity coordination makes a substantial contribution to the super plastic deformation.

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Hua, Ding, Wu Qingling, and Ma Longxiang. "Deformation behaviour in α/β two-phase super-plastic brass." Journal of Materials Science 27, no. 3 (February 1992): 607–10. http://dx.doi.org/10.1007/bf02403867.

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Lukasiewicz, S. A. "Geometrical super-elements for elasto-plastic shells with large deformation." Finite Elements in Analysis and Design 3, no. 3 (October 1987): 199–211. http://dx.doi.org/10.1016/0168-874x(87)90024-2.

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Hua, Ding, Wu Qingling, and Ma Longxiang. "Deformation behaviour in α/β two-phase super-plastic brass." Journal of Materials Science 27, no. 3 (January 1992): 607–10. http://dx.doi.org/10.1007/bf00554024.

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8

Гадалов, Владимир, Vladimir Gadalov, Ирина Ворначева, Irina Vornacheva, Александр Филонович, Alexander Filonovich, Александр Чернышев, and Aleksandr Chernyshev. "Thermo-cycling impact upon velocity choice of titanium alloy super-plastic flow." Science intensive technologies in mechanical engineering 2019, no. 10 (October 29, 2019): 19–25. http://dx.doi.org/10.30987/article_5d6518cd691f02.33724732.

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The modes of the thermo-cyclical deformation of pseudo-α alloys having the super-plastic deformation state under isothermal conditions at temperatures in the field of two-phase state are investigated. The modes for preliminary thermo-processing influencing processing characteristics of VT20 and OT$ alloys, that is, increasing a deformation temperature interval and decreasing processing time are determined.

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Li, Ying Jie, Xiu Zhi Zhang, and Feng Li. "Study on the Super-Plastic Property of ECAPed Magmesium Alloy." Advanced Materials Research 311-313 (August 2011): 640–43. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.640.

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In this paper, the influence of temperature and strain rate on the superplastic deformation behaviors of the Mg-Zn-Nd alloy has been investigated through performing tensile tests at different temperatures and strain rates. After 4 passes of ECAP by route C, the strain-rate sensitivity coefficients reached 0.32 at 300°C, indicating that the ECAPed Mg-Zn-Nd alloy exhibited a good superplasticity at lower temperature. The results of flow activation energy showed that the super-plastic deformation mechanism of magnesium alloys is grain-boundary sliding controlled by grain boundary diffusion.

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Wang, Jun, Guang Lan Liao, Qiang Yu, and Tie Lin Shi. "Oxidation Behavior in Super-Plastic Microforming of Zr₆₅Cu_17.5Ni₁₀Al_7.5 Bulk Metallic Glass." Applied Mechanics and Materials 117-119 (October 2011): 1377–82. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.1377.

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The influence of oxidation behavior on super-plastic microforming of bulk metallic glass Zr65Cu17.5Ni10Al7.5in the super-cooled liquid region was investigated. Samples were heated in air from room temperature to 395°C, 410°C, and 430°C, respectively, and kept under each temperature for 40 minutes. The increased weight of samples and the thickness of oxide layer were measured. Subsequently, the sample was compressed under 410°C with a micro gear silicon mold. In result, the oxide layer of the gear cracked and could be easily removed; also, the X-ray diffractometer showed that the gear core below the oxide layer remained an amorphous structure. It can be concluded that the oxidation behavior of Zr65Cu17.5Ni10Al7.5does not affect the super-plastic deformation, which indicates the feasibility of super-plastic microforming process in air.

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K. UPADHYAY, PAWAN, H. JOSHI, and PANKAJ AGARWAL. "Evaluation of Different Forces for Super Finishing the Internal Surface of Ballizing process." Material Science Research India 9, no. 2 (December 25, 2012): 197–205. http://dx.doi.org/10.13005/msri/090204.

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This paper is an attempt towards comparing experimental and theoretically results of forces obtained by varying interference. with of contact of the Tool and materials , calculated theoretically, may also be helpful for many production and design calculations. The fatigue strength can be increased by 50 to 100% or even more as a result of cold surface plastic deformation. Cold plastic deformation completely eliminates the unwanted stress raisers. Fatigue strength of machine components can be increased by plastic deformation. Various steels, cast irons and non ferrous alloys, all undergo favorable changes in their surface layers form fatigue strength view point as a result of cold plastic deformation. Surface of work piece hardening, perhaps the most effective method of increasing the fatigue strength of machine components. Use of cold plastic deformation increases the wear resistance of machine components. The explanation is that the relationship between the contact area and the force is near linear for these materials, and therefore the contact pressure force as a ratio of force to area is practically constant. In the case of hard metals (for example hardened steels) the significant elasticity causes the contact area to increase more slowly than the force. Therefore the contact pressure force for hardened steels increases with the Ballizing force. As the forces required are excessive, Tensile testing machine .The material of the ball is so selected that it is not suggests 2 to 3 percent interference between the ball and the hole. In the experience Hardened steel balls were used for low carbon, or medium carbon steel bushes. Aluminium bushed and the same hardened steel ball combinations were also used. Ball Ballizing is a mass production process for improving the accuracy and surface finish of holes.

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JINCHOU, Hiroyuki, Takanori KOKUBO, Goroh ITOH, and Yoshinobu MOTOHASHI. "301 Super-plastic deformation of metallic material with ultrafine-grained microstructure." Proceedings of Ibaraki District Conference 2005 (2005): 43–44. http://dx.doi.org/10.1299/jsmeibaraki.2005.43.

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13

Ryś, Janusz, and Wiktoria Ratuszek. "Rolling Texture Formation in Super-Duplex Stainless Steel." Solid State Phenomena 163 (June 2010): 145–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.163.145.

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The present research is a part of project which concerns a deformation behavior of duplex type ferritic-austenitic stainless steels. This paper focuses on the examination of ferrite and austenite textures formed upon thermo-mechanical treatment and deformation textures developed during cold-rolling of super-duplex stainless steel sheet. The character and stability of the textures observed in both phases over a wide deformation range are the result of two-phase morphology formed upon hot- and subsequent cold-rolling. The specific band-like morphology of the ferrite-austenite structure creates different conditions for plastic deformation due to the interaction of both phases and considerably constrained lattice rotations. That is why the processes governing the texture formation in duplex steels are supposed to change in comparison to single phase steels affecting final rolling textures of ferrite and austenite.

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Королев, Альберт, Albert Korolev, Александр Туренко, and Alexandr Turenko. "Model of forming open-ended rings made of elastic rods." Science intensive technologies in mechanical engineering 2019, no. 9 (September 26, 2019): 3–6. http://dx.doi.org/10.30987/article_5d2df087f1b850.47783687.

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The problem of forming open-ended rings by a plastic bend is considered. The influence of technological system super-structural parameters upon a diameter of rings formed is analyzed. The dependences for the calculation of a bending moment of elastic deformation and a bending moment of a plastic one in different sections of a ring are offered.

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Hermanová, Šárka, Ladislav Kander, and Jakub Horváth. "The Effect of Cold Bending Process and Degradation at Boiler Conditions on the Properties of New Austenitic Creep Resistant Steel Super 304H for Boiler Super-Heaters Tubes." Materials Science Forum 891 (March 2017): 230–34. http://dx.doi.org/10.4028/www.scientific.net/msf.891.230.

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This paper is focused on evaluation of the plastic deformation effect, after the cold bending process for new austenitic material Super 304H designed for supercritical conditions. The aim of the project was to qualify the process of cold bending and then verify the properties of these bends in conditions approaching application. This paper presents the results of the plastic deformation effect on changes in the structure and mechanical properties at operating temperatures in corrosive environments coal combustion products and comparison to results before degradation. The tests were carried out on bends in two dimensions of tubes which are the most common sizes used in super-heaters for supercritical power plant boiler. The bends were produced by the method of cold bending on several bending radii in order to obtain information about the structure and behaviour of materials at various stages of deformation. To obtain reliable information tensile test, hardness test and metallographic examination were used on material from straight tubes of the bends and drawn parts before degradation and after degradation.

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16

Jing, Q., R. P. Liu, G. J. Shao, and W. K. Wang. "Preparation and super-plastic deformation of the Zr-based bulk metallic glass." Materials Science and Engineering: A 359, no. 1-2 (October 2003): 402–4. http://dx.doi.org/10.1016/s0921-5093(03)00370-8.

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17

Hu, Wei, Jia Jia Xu, and Ying Zhang. "The Degradation of Saturated Clay’s Un-Drained Shearing Deformation Modulus under Cyclic Loading." Advanced Materials Research 671-674 (March 2013): 151–55. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.151.

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The un-drained shearing deformation modulus of clay will degenerate under cyclic loading. This degeneration is attributed to two reasons, the first one is the reduction of effective pressure due to the increment of super pore pressure; another one is the change of soil’s structure due to the accumulation of plastic shearing strain. Firstly, based on the result of un-drained shearing tests, two formulations were obtained which include initial deformation modulus ratio versus over-consolidated ratio and initial deformation modulus ratio versus initial shearing strain. Then, the quasi-over-consolidated ratio was introduced to consider the effect of super pore pressure, and a fitting formulation was applied to consider the influence of shearing strain. At last, the degenerate formulation of saturated clay’s deformation modulus was deduced, which was proved reasonably by the test results.

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18

Chen, Shang Ping, Wen Juan Yao, and Sheng Qing Zhu. "Nonlinear Method for Load Transfer Model of Super-Long Pile in Layered Soil." Advanced Materials Research 201-203 (February 2011): 1596–600. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1596.

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In this paper, a three-stage softening load transfer model, based on existing experimental data of super-long piles, is proposed; the hyperbola load transfer model is adopted to simulate the nonlinear deformation of pile-tip soil; and the elastic-plastic model of concrete is introduced, giving consideration to the super-long pile shaft deformation under heavy axial loads. Then the models above are implemented into pile-soil load transfer differential equation, and after being solved by iteration method, the nonlinear method for load transfer model of super-long pile in layered soil is established. After that programming of the model calculation is worked out. By comparison with engineering instance, it is shown that the method proposed in this paper is convenient and reliable in engineering practice.

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19

Ryś, Janusz, and Małgorzata Witkowska. "Microstructure and Deformation Behavior of Cold-Rolled Super-Duplex Stainless Steel." Solid State Phenomena 163 (June 2010): 151–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.163.151.

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The present examination is a part of project concerning a deformation behavior of duplex type ferritic-austenitic stainless steels. The investigations included the analysis of ferrite and austenite microstructures formed in cold-rolled sheet of super-duplex stainless steel, major deformation mechanisms operating in both constituent phases and changes in morphology of two-phase structure after the thermo-mechanical treatment and subsequent cold-rolling. Duplex type stainless steels develop the band-like ferrite-austenite morphology in the course of hot- and cold-rolling. This specific two-phase structure creates different conditions for plastic deformation in comparison to single phase steels. The interaction of both phases upon deformation exerts fairly significant influence on structure and texture formation in both constituent phases and in consequence affects the material properties and its behavior upon further processing.

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20

Muñoz-Andrade, Juan Daniel. "Cosmic Micromechanics Connection with Irreversible Deformation Processes in Spatially Extended Crystalline Systems." Materials Science Forum 561-565 (October 2007): 1927–30. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1927.

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The goal of this work is to describe the cosmic micromechanics connection with irreversible deformation processes in spatially extended polycrystalline systems, where the nature of the crystalline structure of the universe in a relativistic framework at Max Plank scale and Edwin Hubble scale play and important role. In this physical construction by applying the theoretical model of Muñoz-Andrade the activation energy for irreversible deformation processes in spatially extended polycrystalline systems is obtained. Consequently, the main results of this work are analyzed in the context of the unified interpretation of Hubble flow, plastic flow and super plastic flow.

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Yue, Yonghai, Qihua Gong, and Qi Zhang. "In SituAtomistic Deformation Mechanisms Study of Nanowires." Journal of Nanomaterials 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/8497242.

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“Smaller is stronger,” sub-, micro-, and nanomaterials exhibit high strength, ultralarge elasticity and unusual plastic and fracture behaviors which originate from their size effect and the low density of defects, different from their conventional bulk counterparts. To understand the structural evolution process under external stress at atomic scale is crucial for us to reveal the essence of these “unusual” phenomena and is momentous in the design of new materials. Our review presents the recent developments in the methods, techniques, instrumentation, and scientific progress of atomic scalein situdeformation dynamics on single crystalline nanowires. The super-large elasticity, plastic deformation mechanism transmission, and unusual fracture behavior related to the experimental mechanics of nanomaterials are reviewed.In situexperimental mechanics at the atomic scale open a new research field which is important not only to the microscopic methodology but also to the practice.

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22

Fu, Ge Yan, and Shi Hong Shi. "Mechanism Research of Low-Stress Threshold of Plastic Accumulation under Super-Low Repeated Impact Stress." Key Engineering Materials 464 (January 2011): 605–8. http://dx.doi.org/10.4028/www.scientific.net/kem.464.605.

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It is discovered that, if material has been applied with super-low impact stress that for certain times, macroscopic plastic deformation may be happen. The stress can be far below the static yield limit of material. The strain rate will decrease with impact times and distance from the surface. For exploring the micro-mechanism of the new deformation phenomena, the paper presents the theory of dislocation slip based on the principle of superposed dislocation vibration and the microscopic dislocation slip model under low-stress repeated impact. Analysis showed that the stress threshold is related to not only material damping, but also the frequency of repeated impact. Lower material damping and higher frequency of repeated impact are favorable to dislocation slip and, consequently, favorable to macroscopic plastic accumulation. Stress threshold being closely related to impact frequency is an important feature of repeated-impact plastic accumulation.

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23

Shi, Yujiao, Yingtao Sun, and Zhaobo Wang. "Super-hydrophobic and super-oleophilic surface based on high-density polyethylene/waste ground rubber tire powder thermoplastic elastomer." Journal of Thermoplastic Composite Materials 33, no. 6 (January 9, 2019): 851–64. http://dx.doi.org/10.1177/0892705718815542.

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Super-hydrophobic and super-oleophilic surface based on high-density polyethylene/styrene–butadiene–styrene block copolymer/waste ground rubber tire powder thermoplastic elastomer (TPE) was successfully prepared while metallographic sandpaper was used as a template. Field emission scanning electron microscope study showed that the molded TPE surface with W7 grade sandpaper possessed the rough microstructure; moreover, the micrometer scale strips resulting from the plastic deformation of TPE matrix could be observed obviously, leading to the increasing surface roughness. Wettability tests showed that the molded TPE surfaces with series sandpapers exhibited the hydrophobic and super-oleophilic properties; moreover, the surface molded with W7 grade sandpaper showed the remarkable super-hydrophobic and super-oleophilic properties.

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24

Kimura, Yuuji, Hideyuki Hidaka, and Setsuo Takaki. "Work-Hardening Mechanism during Super-Heavy Plastic Deformation in Mechanically Milled Iron Powder." Materials Transactions, JIM 40, no. 10 (1999): 1149–57. http://dx.doi.org/10.2320/matertrans1989.40.1149.

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Muñoz-Andrade, Juan Daniel. "Mathematical Model for Super Plastic Flow in Advanced Structural Materials." Materials Science Forum 551-552 (July 2007): 67–72. http://dx.doi.org/10.4028/www.scientific.net/msf.551-552.67.

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Everything in the universe is a result of their own evolution, in consequence all advanced structural materials are physical objects spatially extended in a permanently cosmic connection with the advanced structural universe. In this context, the nature expansion rate of the universe (ξ u) was obtained in a similar way of super plastic flow in terms of the rate reaction theory, with the strong temperature dependence of strain rate as follow: exp 70( / sec)/ 2.26854593 . 18 1 0 − − = =         −         = = km Mpc s kT c Q H P P P u λ ξ Where, QP = the Planck activation energy of the system at the Planck scale (QP = 1.221x1028eV), λP = Planck length (λP = 1.62x10-35m), c = the speed of light (c = 299 792 458 m/s), (c/λP) = the overall frequency factor, k = the Boltzmann constant (k = 8.617x10-5eV/K), TP = the Planck temperature (TP = 1.010285625x1030K) and H0 = the Hubble constant. On the basis of this mathematical expression and their combination with the Orowan equation, it was obtained the mathematical model to predict the activation energy (Q) that is necessary to the glide cellular dislocations during deformation of the super plastic advanced structural materials. Consequently, in this work the application of this mathematical model for super plastic flow in advanced structural materials and the concept of cellular dislocation are reviewed in order to integrate in a general form the unified interpretation of Hubble flow, plastic flow and super plastic flow [1-3].

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Sadhasivam, M., T. Pravin, and S. Raghuraman. "Determination of Mechanical Properties on Aluminium with 5% Copper Powder Metallurgy Route Compacts through Equal Channel Angular Pressing." Applied Mechanics and Materials 813-814 (November 2015): 161–65. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.161.

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The need for super-plasticity and high strength leads to the development of Severe Plastic Deformation technique. The strength of the material is directly dependent upon the grain size of the material. So, there is a need for producing Ultra-Fine Grain microstructure (UFG). UFG material is the material with very small grain size in the range of sub-micrometre. Application of severe plastic deformation, imparts extremely high strain. Equal channel angular pressing (ECAP) is a severe plastic deformation process in which the metal specimen is pressed through an angular channel of equal cross section. The material is subjected to shear deformation and strain is imparted in the specimen. Geometric parameters such as channel angle and corner angle play a major role in grain refinement. Aluminium (Al) specimens are subjected to undergo severe plastic deformation. Since, the strength of Al is not high, other materials are added in order to enhance its mechanical properties by matrix work hardening. Copper (Cu) along with Al shows increase in its strength and also in hardness. An attempt is made with Aluminium and copper, blended in the ratio 95:5 by weight with the main objective to study the Tensile strength, Hardness and Percentage Elongation properties of the specimen.

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Chen, Xiao Hui, Chun Xian Jiang, Xue Ping Ren, Hong Liang Hou, and He Jun Li. "Microstructure and Properties of Super Plastic Diffusion Bonded 00Cr25Ni7Mo3N Duplex Stainless Steel Joint." Applied Mechanics and Materials 34-35 (October 2010): 350–54. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.350.

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The super plastic diffusion bonding behavior of 00Cr25Ni7Mo3N duplex stainless steel was performed on Gleeble-1500 hot simulator. The microstructure of the bonding interface region was studied by using optical microscope (OM), scanning electron microscope (SEM). The mechanical property of the joint was characterized by tensile strength tests. The results indicate that the strength of joint was improved with the increase of the bonding temperature, the applied pressure and the hold time. The suitable bonding temperature is higher about 100°C than its super plastic temperature. The initial bonding boundary were disappeared and the voids were closed by hot plastic deformation under the bonding condition like T=1323K, P=20MPa, t=12min. At the same condition, the grain grew up across the interface by atomic diffusion and the interfacial migration, and the strength of joints was high as 440MPa.

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Farzin, Mahmoud, Reza Jafari Nedoushan, and Mohammad Mashayekhi. "Simulation of Super-Plastic Forming Based on a Micro-Structural Constitutive Model and Considering Grain Growth." Key Engineering Materials 473 (March 2011): 610–17. http://dx.doi.org/10.4028/www.scientific.net/kem.473.610.

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Constitutive models based on dominant mechanisms in hot forming are proposed. These models consider inter-granular deformation, grain boundary sliding, grain boundary diffusion and grain growth. New stress-strain rate relationships are proposed to predict deformation due to grain boundary sliding and grain boundary diffusion. Beside a Taylor type polycrystalline constitutive model, a visco-plastic relation in conjunction with a yield function is used to predict inter-granular deformation with much less computational costs. The proposed models are calibrated with tensile test data of AA5083 at . The calibrated models closely fit simple tension experimental data for various strain rates and strains. Then as an example the models are used to simulate a tray forming experiment. Dome heights and tray thicknesses at various positions during forming time can well predict experimental observations.

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Wu, Heng An, Ai Kah Soh, Xiu Xi Wang, and Z. H. Sun. "Strength and Fracture of Single Crystal Metal Nanowire." Key Engineering Materials 261-263 (April 2004): 33–38. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.33.

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Numerical simulations have been carried out to determine the mechanical property of single crystal copper nanowire subjected to tension using the molecular dynamics method. The mechanism of deformation, strength and fracture are elucidated based on these numerical simulations. No strengthening is found after yielding of the single crystal nanowire. The simulation results show that the strength of copper nanowire is far greater than that of realistic polycrystalline bulk copper. By decreasing the size of the nanowire's cross-section, which leads to an increase of the ratio of surface atoms, the yield stress is increased. The strain rate has an influence on strength, and mechanism of deformation and fracture. When the strain rate is comparatively low, plastic deformation arises from dislocation slips and twins. However, when the strain rate is sufficiently high, amorphization is a dominant factor of plastic deformation and super-plasticity is found. The fracture process is demonstrated using the atomic images.

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Liu, Yue Ming, Ya Dong Gong, Wei Ding, and Ting Chao Han. "Simulation and Experiment on the Residual Stress in Super-High Speed Grinding." Advanced Materials Research 135 (October 2010): 238–42. http://dx.doi.org/10.4028/www.scientific.net/amr.135.238.

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In this paper, effective finite element model have been developed to simulation the plastic deformation cutting in the process for a single particle via the software of ABAQUS, observing the residual stress distribution in the machined surface, the experiment of grinding cylindrical workpiece has been brought in the test of super-high speed grinding, researching the residual stress under the machined surface by the method of X-ray diffraction, which can explore the different stresses from different super-high speed in actual, and help to analyze the means of reducing the residual stresses in theory.

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Peng, Ru Lin, Yan Dong Wang, Guo Cai Chai, Nan Jia, Sten Johansson, and Gang Wang. "On the Development of Grain-Orientation-Dependent and Inter-Phase Stresses in a Super Duplex Stainless Steel under Uniaxial Loading." Materials Science Forum 524-525 (September 2006): 917–22. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.917.

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Microstresses due to intergranular and inter-phase interactions in an austenitic-ferritic super duplex steel (SAF 2507) under uniaxial compressive deformation have been studied by in-situ neutron diffraction experiments. Lattice strains of several hkl planes of austenite respective ferrite were mapped as a function of sample direction at a number of load levels during loading into the plastic regime and unloading. The analysis of the experimental results has shown that during loading both grain-orientation-dependent and inter-phase stresses were generated under plastic deformation that was inhomogeneous at the microstructural level. Residual stresses depending on the grain-orientation and phase have been found after unloading. The results also indicate stronger intergranular interactions among the studied hkl planes of austenite than those of ferrite.

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32

Muñoz-Andrade, Juan Daniel. "On the Phenomenology and Mechanics of Super Plastic Flow in Advanced Structural Materials." Materials Science Forum 551-552 (July 2007): 147–52. http://dx.doi.org/10.4028/www.scientific.net/msf.551-552.147.

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In connection with ancient and recent view on cosmology, it is interesting to note that our universe could be a spherical crystal and it moves as a crystal in a relative position with others spherical universes, where the Burgers vector for cellular dislocations dynamics is the Hubble length: λH=1.32x1026m. The expansion process of this polycrystalline spatially extended system obey the hyperbolic granular flow, which it is due to an accelerated motion manifested during the deformation process of super plastic advanced structural universes in a similar behaviour of super plastic advanced structural materials. Consequently, in this work the phenomenology and mechanics of super plastic flow are analyzed in the context of the unified interpretation of Hubble flow, plastic flow and super plastic flow, where the combination of fundamentals constants with the natural Planck length, allows obtain in a closed agreement with the Orowan equation the magnitude of the nature Burgers vector of dislocation in the cosmic structure for the universe as follow: 1.62 10 . 35 3 0 x m c H G b P − ⊥ ⊥ ⊥ = = = = h λ ρ ν Where, b⊥ = magnitude of the nature Burgers vector for the universe (b⊥ = 1.62x10-35m), λP = Planck length (λP = 1.62x10-35m), H0 = the Hubble parameter (H0=70 (km/sec)/Mpc = 2.26854593 x10-18s-1), ρ⊥ = dislocation density (ρ⊥ = 1.273x1011 dislocations/m2) in the universe. ν⊥ = the recession velocity of galaxies related with dislocations dynamics in the cosmic structure (ν⊥ = 1100x103 m/s, it is the recession velocity of the Virgo super cluster at 16 Mpc distance). h = h / 2π . Here h = the Planck constant (h = 6.6262x10-34 Joule-s), G = the Newtonian constant (G = 6.67259x10-11 m3/kg s2) and c = the speed of light (c = 299 792 458 m/s) [1-3].

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Shin, Da Woon, Hong Min, and Jin Kyu Lee. "Microstructure and Mechanical Properties of Cu-Ni-Zr-Ti Bulk Metallic Glass Composites by Spark Plasma Sintering." Korean Journal of Metals and Materials 59, no. 5 (May 5, 2021): 281–88. http://dx.doi.org/10.3365/kjmm.2021.59.5.281.

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In the present study, Cu54Ni6Zr22Ti18 bulk metallic glass composites were developed by spark plasma sintering(SPS) using gas atomized Cu54Ni6Zr22Ti18 metallic glass powders and Ta powders. Metallic glass composites with Ta phase were fabricated by SPS. The successful consolidation of Cu54Ni6Zr22Ti18 metallic glass matrix composites with the Ta phase was achieved through the strong bonding due to the plastic deformation of the Ta powder and the super-plastic behavior of the metallic glass powder in the supercooled liquid state during SPS. The deformed Ta phases were well distributed in the Cu54Ni6Zr22Ti18 metallic glass matrix. The compressive fracture strength and total strain were 1770 Mpa and 10.2%, respectively, for the Cu54Ni6Zr22Ti18 bulk metallic glass composite with 40 wt% Ta phases. The uniformly dispersed deformed Ta phase in the Cu54Ni6Zr22Ti18 metallic glass matrix effectively impedes the propagation of the first shear band and generates a second shear band, causing a crossing of the shear bands, resulting in an improvement in plastic strain. This increase in plastic deformation is related to the fact that the deformed Ta phase, uniformly distributed in the Cu54Ni6Zr22Ti18 metallic glass matrix, acts as a source of shear bands and at the same time effectively suppresses the movement of the shear bands, dispersing the stress and causing wide plastic deformation.

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Cojocaru, Elisabeta Mirela, Anna Nocivin, Doina Răducanu, Mariana Lucia Angelescu, Ion Cinca, Irina Varvara Balkan, Nicolae Șerban, and Vasile Dănuț Cojocaru. "Microstructure Evolution during Hot Deformation of UNS S32750 Super-Duplex Stainless Steel Alloy." Materials 14, no. 14 (July 14, 2021): 3916. http://dx.doi.org/10.3390/ma14143916.

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The present paper analyzes UNS S32750 Super-Duplex Stainless Steel hot deformation behavior during processing by upsetting. The objective of this paper is to determine the optimum range of deformation temperatures, considering that both austenite and ferrite have different deformation behaviors due to their different morphology, physical, and mechanical properties. Because the capability of plastic deformation accommodation of ferrite is reduced when compared to austenite, side cracks and fissures can form during the hot deformation process. Consequently, it is important to find the optimum conditions of deformation of this type of stainless steel to establish the best processing parameters without deteriorating the material. The experimental program involved the application of hot deformation by the upsetting method on a series of samples between 1000 °C and 1275 °C, with a total degree of deformation of 30%. The resultant samples were examined by SEM-EBSD to establish and analyze the evolution of the phases present in the structure from several points of view: nature, distribution, morphology (size and shape), and their structural homogeneity. The GROD (Grain Reference Orientation Deviation) distribution map was also determined while taking into account the possible precipitation of the secondary austenite phase (γ2-phase) and the analysis of the dynamic recrystallization process according to the applied deformation temperature. The main conclusion was that UNS S32750 SDSS steel can be safely deformed by upsetting between 1050–1275 °C, with an experimented total degree of deformation of 30%.

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Mészáros, István, and Bálint Bögre. "Plastic Deformation and Thermal Induced Phase Transformation in 2507 Type Super Duplex Stainless Steel." Materials Science Forum 885 (February 2017): 184–89. http://dx.doi.org/10.4028/www.scientific.net/msf.885.184.

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The aim of this study was to investigate the effect of the previously applied cold rolling and the latter heat treatment for the eutectoidal decomposition of δ-ferrite in 2507 type superduplex stainless steel (SDSS). The samples were cold rolled at seven different deformation rates which was followed by heat treatment at were 20, 700, 750, 800 and 850 °C temperatures. The rolled and heat treated samples were investigated by hardness tester, AC magnetometer and thermoelectric power measurement. The activation energy of the decomposition was determined by the Arrhenius equation through the results of the AC magnetometer measurement.

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Wu, F. F., W. Zheng, J. W. Deng, D. D. Qu, and J. Shen. "Super-high compressive plastic deformation behaviors of Zr-based metallic glass at room temperature." Materials Science and Engineering: A 541 (April 2012): 199–203. http://dx.doi.org/10.1016/j.msea.2012.02.025.

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Li, Li. "Micro structure and texture evolution during super plastic deformation of Mg–Re extruded alloy." Journal of Alloys and Compounds 555 (April 2013): 255–62. http://dx.doi.org/10.1016/j.jallcom.2012.12.072.

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Renton, Neill C., Abdu M. Elhoud, and William F. Deans. "Effect of Plastic Deformation on the Corrosion Behavior of a Super-Duplex Stainless Steel." Journal of Materials Engineering and Performance 20, no. 3 (June 29, 2010): 436–44. http://dx.doi.org/10.1007/s11665-010-9688-z.

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Wolfe, I. M., and A. Ball. "Ductility in high-chromium super-ferritic alloys—II. Plastic deformation and crack-zone shielding." Acta Metallurgica et Materialia 39, no. 11 (November 1991): 2771–81. http://dx.doi.org/10.1016/0956-7151(91)90094-h.

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Lee, Jeong Min, Dong Keun Lee, Jae Mean Koo, and Chang Sung Seok. "Evaluation on Thermo-Mechanical Fatigue Life of IN738LC Using Finite Element Analysis." Applied Mechanics and Materials 467 (December 2013): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amm.467.20.

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In this paper, thermo-mechanical fatigue tests were performed for the nickel-based super alloy IN738LC, after which the thermo-mechanical fatigue life was evaluated using finite element analysis. Nickel-based super alloy is used as the main material of turbine blades, which are important equipment in thermal power generation plants. In general, such materials receive three types of damage under thermo-mechanical fatigue loading. In the case of low-cycle fatigue behavior in which large plastic deformation mainly occurs, the lifetime can be decided by its relationship with the plastic strain amplitude. In order to obtain the plastic strain amplitude from the measured strain amplitude, a hysteresis loop should be derived. However, low-cycle fatigue tests are difficult. Moreover, precise experimental techniques are required to obtain the hysteresis loops. In this study, after thermo-mechanical fatigue tests were performed, thermal mechanical fatigue tests on IN738LC were simulated using finite element analysis. The results of analysis were verified by comparing with the hysteresis loops of an experiment

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Dobrescu, Mircea, and Marius Vasilescu. "Processing and Superelasticity of Ni-Ti Shape Memory Alloys." Key Engineering Materials 660 (August 2015): 103–7. http://dx.doi.org/10.4028/www.scientific.net/kem.660.103.

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In the paper is shown the study of super elasticity of Ni-Ti shape memory alloys from the point of view of stored energy, strain dependencies and martensitic transformations that influence superelasticity of Ni-Ti shape memory alloys [1]. We also present the influence of temperature and alloy composition on the properties of Ni-Ti alloys after plastic deformation and heat treating [2].

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Wang, Wen Yan, Jian Xu, and Jing Pei Xie. "Study of the Impact Abrasive Wear of New Super-High Manganese Steel." Key Engineering Materials 575-576 (September 2013): 550–53. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.550.

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Based on the traditional Mn13, the super-high manganese steel Mn18 was melted by means of adjusting the amount of C, Mn, adding a certain amount of alloying elements Cr, Mo etc and modification. The results show that with low-impact energy abrasive wear for 60 minutes, the wear resistance of super-high manganese steel Mn18 was greatly improved by contrast with that of Mn13, and the hardness of wear surface was increased slowly with the elapse of the wear time. However, under the high impact energy, the wear resistance of Mn18 is 1.5 times as high as that of Mn13, and the hardness of wear surface was increased to HB440 in a short time. The main wear forms were: cutting, gouging wear and plastic deformation. Typical TEM morphologies of subsurface wear structure consist mostly of high density dislocations, deformation bands.

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Muñoz-Andrade, Juan Daniel. "Threshold Stress for Super Plastic Flow in Spatially Extended Crystalline Systems." Materials Science Forum 475-479 (January 2005): 3013–16. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.3013.

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In general, the mechanical behavior of superplastic spatially extended crystalline systems (SP-SECS) is characterized by a sigmoidal relationship between the applied stress and the steady state strain rate. The sigmoidal curve is defined by three regions: low stress - region I, intermediate stress or superplastic - region II and high stress - region III. The region I is known as the region where the threshold stress exists, but there are controversies on their existence. In this way, some experimental results reported in the past are analyzed. Earlier investigations have reported the apparent activation energy for creep in SP-SECS as a function of the applied stress, where it is exhibited a marked dependence of impurities or precipitates concentration. In addition, recent experimental evidences have revealed that the unified interpretation of creep, plasticity and superplasticity is the deductive rule [1]. In order to describe the interaction between precipitates at grain boundaries and dislocations during deformation processes a phenomenological expression for the threshold stress at the Grain Boundary in SP-SECS is described in this work.

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Angelescu, Mariana Lucia, Elisabeta Mirela Cojocaru, Nicolae Șerban, and Vasile Dănuț Cojocaru. "Evaluation of Hot Deformation Behaviour of UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy." Metals 10, no. 5 (May 21, 2020): 673. http://dx.doi.org/10.3390/met10050673.

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The super-duplex stainless steel UNS S32750 consists of two main phases, austenite and ferrite, which differ not only by their morphology, physical, and mechanical properties, but also by their deformation behaviour. A heterogenous deformation can be obtained during thermomechanical processing, generating internal stresses and sometimes fissures or cracks on sample lateral surfaces, due to ferrite’s phase lower potential of plastic deformation accommodation in comparison with austenite phase. The research objective is to determine the optimum range of the applied deformation degree, during hot deformation processing by upsetting of the super-duplex steel (SDSS) UNS S32750. In the experimental program several samples were hot deformed by upsetting, by applying a deformation degree between 5–50%, at 1050 °C and 1300 °C. The most representative hot-deformed samples were selected and analysed by scanning electron microscope-Electron Backscatter Diffraction (SEM-EBSD), to determine the main microstructural characteristics obtained during thermomechanical processing. When considering the experimental results, the influence of the applied deformation degree on the microstructure has been evaluated. Microstructural features, such as nature, distribution, morphology and relative proportion of constituent phases, Grain Reference Orientation Deviation (GROD), and recrystallization (RX), were analysed, in correlation with the applied deformation degree. Finally, it was concluded that the UNS S32750 alloy can be safely hot deformed, by upsetting, at 1050 °C and 1300 °C, with a maximum applied deformation degree of 20% at 1050 °C and, respectively, by 50% at 1300 °C.

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Li, Xiao Wu. "Direct Characterization of Various Deformation Microstructures in Metals by Electron Channeling Contrast Technique in SEM." Advanced Materials Research 79-82 (August 2009): 215–18. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.215.

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Recent research findings on the electron channeling contrast (ECC) characterization of various deformation microstructures in some metals were summarized. It is shown that the ECC technique can easily image, in a wide field of view, typical dislocation structures in fatigued Cu single crystals, as well as the relevant dislocation arrangements in deformation bands (DBs). The thermal instability of cyclic deformation induced dislocation structures in Cu single crystals under annealing, and microstructural instability of ultrafine-grained (UFG) Cu produced by equal channel angular pressing (ECAP) under annealing or deforming were also well detected by ECC observations. In addition, a trial observation of the plastic deformation micro-features around the fatigue crack (tip) in Al6XN super-austenitic stainless steels was also made by the ECC technique.

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Valiev, Ruslan Z. "Grain Boundary Design of Bulk Nanomaterials for Advanced Properties." Diffusion Foundations 5 (July 2015): 43–54. http://dx.doi.org/10.4028/www.scientific.net/df.5.43.

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Nanostructuring of metals and alloys by severe plastic deformation techniques is an effective way of enhancing their mechanical and functional properties. The features of the nanostructured materials produced by severe plastic deformation (SPD) are stipulated by forming of ultrafine-sized grains as well as by the state of grain boundaries. The concept of grain boundary (GB) design of ultrafine-grained metals and alloys is developed for enhancement of their properties by tailoring grain boundaries of different types (low-angle and high-angle ones, special and random, equilibrium and nonequilibrium) and formation of grain boundary segregations and precipitations by SPD processing. The paper presents experimental data demonstrating the super-strength and “positive” slope of the Hall-Petch relation when passing from micro-to nanostructured state in a number of metallic materials subjected to severe plastic deformation. The nature of the superior strength is associated with new strengthening mechanisms and the difficulty of generation of dislocations from grain boundaries with segregations. This new approach is used for achieving the enhanced strength in several commercial Al and Ti alloys as well as steels subjected to SPD processing.

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Tanaka, Katsushi, Hiromitsu Ide, Yoshinori Sumi, Kyosuke Kishida, and Haruyuki Inui. "Plastic Deformations in L1₀-Ordered Single Crystals with their c/a Ratios Less than Unity." Materials Science Forum 561-565 (October 2007): 459–62. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.459.

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Compressive deformation of L10-ordered single crystals of FePd whose c/a ratio less than unity have been investigated from room temperature to 823 K. The results show that the critical resolved shear stress (CRSS) for octahedral glide of ordinary dislocations is smaller than that of super-lattice dislocations in all the temperature range investigated, that is the opposite sense to the case of Ti-56 mol% Al. The CRSS for ordinary dislocations virtually independent to the temperature. On the other hand, the CRSS for super dislocations exhibits a weak positive temperature dependence from room temperature up to 573 K and decreases in higher temperatures.

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Zhou, Xiao Lei, Zhe Shi, and Gui Fang Zhang. "The Evolution of Non-Metallic Inclusions in IF Steel." Applied Mechanics and Materials 696 (November 2014): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amm.696.62.

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At present, China's IF steel production has get a certain scale. But IF steel production is still in the primary stage of development. Therefore, the process control of inclusions in IF steel have become a pressing matter of the moment. This has important theoretical value and practical significance for further development of IF steel production in China. According to the size, the inclusions can be divided into super micro inclusions, micro inclusions and micro inclusions in the steel. According to the deformation capacity, inclusions can be divided into plastic inclusions, semi plastic inclusion and brittle inclusion.

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Mitsak, A., B. Aour, and F. Khelil. "Numerical Investigation of Plastic Deformation in Two-turn Equal Channel Angular Extrusion." Engineering, Technology & Applied Science Research 4, no. 6 (December 22, 2014): 728–33. http://dx.doi.org/10.48084/etasr.517.

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There has been a number of investigations in recent years reporting on the structure and properties of materials deformed to super plastic deformation (SPD). During SPD new textures can be formed and abnormal characteristics are displayed, attracting a growing research interest.¶ Equal channel angular extrusion (ECAE) is a method often used to obtain large plastic strains. However, according to experimental results, there is a large tensile stress in the sample during deformation, which may lead in some cases, to cracking in metallic alloys and large curvature in polymeric materials. In order to overcome these drawbacks, the ECAE process can be conducted at high temperatures. But this contributes significantly to a decreased level of plastic deformation induced in the sample. Hence, a tool with multi-pass seems to be a very appropriate solution. In this paper, a new geometry die composed of two elbows has been simulated by finite element method aiming to provide an insight into the mechanisms of deformation and to determine the optimum geometry of the tool. The numerical results show that the length and the section of the second channel play a significant role on the homogeneity of the plastic strain distribution. It has been found that good homogeneity was obtained when the second channel has the same section as that of the entrance and the exit channels and with a length equal to three times of its width.

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Kozlov, A. V. "Peculiarities in strengthening of Nb and Ta due to super-imposed ultrasonic and plastic deformation." Ultrasonics 32, no. 3 (May 1994): 235–36. http://dx.doi.org/10.1016/0041-624x(94)90039-6.

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Journal articles on the topic 'Super Plastic Deformation'

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