Kinematic and isotropic strain hardening in copper with highly aligned nanoscale twins

被引：40

作者：

Wang, Hao ^{[1
]}

You, Zesheng ^{[1
]}

Lu, Lei ^{[2
]}

机构：

[1] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, 200 Xiaolingwei St, Nanjing 210094, Jiangsu, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Liaoning, Peoples R China

来源：

MATERIALS RESEARCH LETTERS | 2018年 / 6卷 / 06期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Nanotwins; back stress; kinematic hardening; strain rate effect; threading dislocations; INDUCED PLASTICITY STEELS; NANOTWINNED COPPER; DEFORMATION MECHANISMS; INTERNAL-STRESSES; STAINLESS-STEEL; SIZE DEPENDENCE; BACK STRESS; GRAINED CU; METALS; BAUSCHINGER;

D O I：

10.1080/21663831.2018.1455752

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The kinematic and isotropic strain hardening was investigated in columnar-grained copper with preferentially oriented nanoscale twins deformed at two different strain rates of 5 x 10(-5) and 5 x 10(-3) s(-1). A significant back stress is caused majorly by threading dislocation pile-up and accumulation at the grain boundaries and is strain rate independent. The isotropic hardening associated with an increment in the local effective stress stems from dislocation storage at twin boundaries, and a high strain rate is beneficial for enhancing isotropic strain hardening and tensile ductility. [GRAPHICS] IMPACT STATEMENT Long-range back stress was detected to develop during plastic deformation of nanotwinned structures, majorly caused by pile-up and accumulation of threading dislocations at grain boundary regions.

引用

页码：333 / 338

页数：6

共 38 条

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