The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Shi Chong-zhe - One of the best experts on this subject based on the ideXlab platform.
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Plastic Deformation Behavior of P92 Steel
Journal of Xi'an Technological University, 2020Co-Authors: Shi Chong-zheAbstract:Plastic Deformation behavior has important engineering significance for safe service and strain processing of P92 steel.To provide the theoretical basis of safe service and Plastic Deformation forming,Plastic Deformation behavior of P92 steel is studied.by means of static tensile test.The results showed that both uniform Plastic Deformation and non-uniform Plastic Deformation consist of three stages,its strain hardening exponents are 0.17,0.26,0.20,0.22,0.40,0.82.In the non-uniform Plastic Deformation,martensite laths expand along the elongation direction of Deformation,while the martensite laths rotate round the elongation direction with the increase of Deformation.With necking rate Ψ increases,the relative elongation of martensite lath ΔL/L0 gradually becomes stable,the decrease rate of angle θ of martensite lath to tensile axis is slowed.
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Plastic Deformation Behavior of M5 Zirconium Alloy
Journal of Xi'an Technological University, 2020Co-Authors: Shi Chong-zheAbstract:In order to study the Plastic Deformation behavior of zirconium alloys to provide data for engineering applications,the tensile properties of domestic and France-made M5 zirconium alloy nuclear fuel cladding tubes were studied by means of static tensile test at room temperature and 400 ℃.The results show that the tensile properties of domestic and France-made M5 have no significant differences.In the uniform Plastic Deformation stage,when tensile Deformation happens at room temperature,the hardening exponent of France made M5 is slightly higher than that of domestic M5.When the two kinds of materials are tensely deformed at 400 ℃,the uniform Plastic Deformation stage consists of two stages,namely pre-uniform Plastic Deformation stage(n1) and post-uniform Plastic Deformation stage(n2).The n1 of France-made M5 is significantly higher than that of domestic M5,n2 of France-made M5 is slightly higher than that of domestic M5.
Li Wang - One of the best experts on this subject based on the ideXlab platform.
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Plastic Deformation of Pressured Metallic Glass
Materials, 2017Co-Authors: Yun Cheng, C.x. Peng, Zhen-ting Zhang, Pengfei Wang, Sheng-zhong Yuan, Li WangAbstract:Although pressured metallic glass (MG) has been reported in the literature; there are few studies focusing on pressure effects on the structure; dynamics and its Plastic Deformation. In this paper; we report on and characterize; via molecular dynamics simulation, the structure and dynamics heterogeneity of pressured MGs, and explore a causal link between local structures and Plastic Deformation mechanism of pressured glass. The results exhibit that the dynamical heterogeneity of metallic liquid is more pronounced at high pressure, while the MGs were less fragile after the release of external pressure, reflected by the non-Gaussian parameter (NGP). High pressure glass shows better Plastic Deformation; and the local strain zone distributed more uniformly than of in normal glass. Further research indicates that although the number of icosahedrons in pressured glass was much larger than that in normal glass, while the interpenetrating connections of icosahedra (ICOI) exhibited spatial correlations were rather poor; In addition, the number of ‘fast’ atoms indexed by the atoms’ moving distance is larger than that in normal glass; leading to the sharp decreasing in number of icosahedrons during Deformation. An uniform distribution of ‘fast’ atoms also contributed to better Plastic Deformation ability in the pressured glass. These findings may suggest a link between the Deformation and destruction of icosahedra with short-range order.
Igor V. Alexandrov - One of the best experts on this subject based on the ideXlab platform.
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Finite element analysis of Plastic Deformation in twist extrusion
Computational Materials Science, 2012Co-Authors: Marat I. Latypov, Igor V. Alexandrov, Yan BeygelzimerAbstract:Abstract Twist extrusion (TE), a promising severe Plastic Deformation (SPD) technique for grain refinement down to ultrafine/nanocrystalline microstructures, was introduced as an attempt to provide large Plastic Deformation conditions similar to those in high pressure torsion while allowing large workpiece dimensions for industrial applications. As a relatively new SPD technique, TE requires in-depth investigation of its Plastic Deformation characteristics. The present study investigates the influence of process parameters such as backward pressure and friction on the loading history, the stress/strain states, and the final shape of processed workpieces using the finite element method. The results provide a basis for reasonable decision of processing conditions and also identify prerequisites for studies in formability and fracture of metals subjected to TE.
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Nanostructured materials from severe Plastic Deformation
Nanostructured Materials, 1999Co-Authors: R Z Valiev, Igor V. AlexandrovAbstract:Abstract Recent results of the development of the severe Plastic Deformation methods to fabricate bulk nanostructured materials as well as results of their thorough structural characterization and investigations of their unusual Deformation behavior and novel mechanical properties are presented. The structural model of nanomaterials processed by severe Plastic Deformation methods is developed on the basis of the obtained results.
Michio Kiritani - One of the best experts on this subject based on the ideXlab platform.
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dynamic observation of dislocation free Plastic Deformation in gold thin foils
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2003Co-Authors: Yoshitaka Matsukawa, Masao Komatsu, Kazuaki Yasunaga, Michio KiritaniAbstract:Ductile fracture of metals produces a thin foil portion, which is observable by transmission electron microscopy, at the fractured edge. The thin foil portion shows unusual Deformation microstructure, which contains no dislocations, but contains vacancy-type point defect clusters at extraordinarily high density. Dynamic observation of the Deformation process revealed that these defect clusters are produced in the portion of local heavy Deformation; however, no dislocation motion was observed during the course of the heavy Plastic Deformation, constituting direct evidence that the unusual Deformation microstructure is produced by Plastic Deformation without dislocations. Also, the Deformation was found to involve 14% elastic Deformation, indicating that the dislocation-free Plastic Deformation occurs under an extraordinarily high internal stress level of more than 10 GPa, which is comparable to the ideal strength of metals. Furthermore, during the dislocation-free Plastic Deformation, equal-thickness fringes were found to disappear temporarily, suggesting that instability of crystalline state under extraordinarily high internal stress level is a key factor for the mechanism of dislocation-free Plastic Deformation.
Jorge Luis González-velázquez - One of the best experts on this subject based on the ideXlab platform.
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Plastic Deformation Mechanisms
Mechanical Behavior and Fracture of Engineering Materials, 2020Co-Authors: Jorge Luis González-velázquezAbstract:This chapter begins with an introduction of the crystalline structure and crystalline defects of solid materials and the definition of hot and cold work. Then, a full description of the dislocation slip mechanism is presented, including an explanation of the direct observation of dislocations by transmission electron microscopy. Based on the preceding ideas, a description of the slip modes and their associated dislocation substructures is given. The chapter concludes with a brief description of the Plastic Deformation mechanism by twinning.
