IMECH-IR  > 流固耦合系统力学重点实验室
Effect of Dislocation Density Gradient on Deformation Behavior of Pure Nickel Subjected to Torsion
He D(何东); Huan Y(郇勇); Li Q
Source PublicationJOINT 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
Conference NameJoint Conferences of International Conference on Materials Science and Engineering Application (ICMSEA) / International Conference on Mechanics, Civil Engineering and Building Materials (MCEBM)
Conference DateAPR 21-23, 2017
Conference PlaceNanjing, PEOPLES R CHINA
Abstract

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.

KeywordDislocation Gradient Deformation Behavior Work-hardening Rate Pure Nickel
WOS IDWOS:000426987000041
Funding OrganizationThe 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.
ISBN978-1-60595-448-6
Indexed ByCPCI-S
Language英语
Citation statistics
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/75558
Collection流固耦合系统力学重点实验室
Recommended Citation
GB/T 7714
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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