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Effect of Dislocation Density Gradient on Deformation Behavior of Pure Nickel Subjected to Torsion
He D(何东); Huan Y(郇勇); Li Q
会议录名称JOINT CONFERENCES OF 2017 INTERNATIONAL CONFERENCE ON MATERIALS SCIENCE AND ENGINEERING APPLICATION (ICMSEA 2017) AND 2017 INTERNATIONAL CONFERENCE ON MECHANICS, CIVIL ENGINEERING AND BUILDING MATERIALS (MCEBM 2017)
2017
会议名称Joint Conferences of International Conference on Materials Science and Engineering Application (ICMSEA) / International Conference on Mechanics, Civil Engineering and Building Materials (MCEBM)
会议日期APR 21-23, 2017
会议地点Nanjing, PEOPLES R CHINA
摘要

Gradient hierarchical structures, including grain size gradient, twin density gradient, and texture gradient, are believed to broke up the long-standing dilemma-"strength-ductility trade-off' in materials science. Here we study the effect of dislocation density gradient on deformation behavior of pure nickel subjected to torsion. After applying torsion to cylindrical pure nickel samples, we find that Vickers hardness gradually decreased from surface to centre and the there is no obvious grain size gradient along the radial direction. The compression tests have been conducted on samples with different thickness of gradient layers. The results indicate that the yielding strength of the material can be three-times improved. Especially, the work-hardening rate "up-turn" phenomenon which was usually found in gradient nano-structures is presented in the torsion deformed pure nickel. Finally, the possible reasons and the effect of thickness of gradient structure are carefully discussed.

关键词Dislocation Gradient Deformation Behavior Work-hardening Rate Pure Nickel
WOS记录号WOS:000426987000041
资助信息The author (He Dong) gratefully acknowledges the financial support by National Natural Science Foundation of China under contract (No. 51401226), Outstanding Young Scholars Foundation (XN071010) and Startup FundProgram of North China University of Technology.
ISBN号978-1-60595-448-6
收录类别CPCI-S
语种英语
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文献类型会议论文
条目标识符http://dspace.imech.ac.cn/handle/311007/75558
专题流固耦合系统力学重点实验室
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He D,Huan Y,Li Q. Effect of Dislocation Density Gradient on Deformation Behavior of Pure Nickel Subjected to Torsion[C],2017.
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