Kinking induced plasticity in a novel refractory high-entropy alloy

被引：2

作者：

Cui, Dingcong ^{[1
]}

Bai, Xiaoyu ^{[1
]}

Liu, Xin ^{[1
]}

Qiu, Yunji ^{[1
]}

Wang, Zhijun ^{[1
]}

Li, Junjie ^{[1
]}

Wang, Jincheng ^{[1
]}

He, Feng ^{[1
,2
,3
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen 518063, Peoples R China

[3] Collaborat Innovat Ctr Northwestern Polytech Univ, Collaborat Innovat Ctr, Shanghai 201100, Peoples R China

来源：

VACUUM | 2024年 / 227卷

基金：

中国国家自然科学基金;

关键词：

Refractory high entropy alloys; Plastic deformation; Kink bands; Dislocations; Mechanical properties; DESIGN;

D O I：

10.1016/j.vacuum.2024.113424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel Ti41V27Hf13Nb13Zr6 refractory high-entropy alloy (RHEA) with an excellent fracture elongation of 30 % at a high strength level of 986 MPa was successfully fabricated. We discovered that kinking induced plasticity, involving successive stages of dislocation arrangement, pre-kinking, and the coalescence of multiple kink bands. The soft character of kinking originated from the degraded dislocation density within the kink bands. As such, the interplay between strain hardening caused by dislocation accumulation and the softening effect due to kink bands led to a plateau-type engineering stress-strain curve to large strains. These findings provide a novel design pathway to achieve ductile RHEAs via deformation kinking.

引用

页数：6

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