Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

被引：89

作者：

Naeem, Muhammad ^{[1
,2
]}

He, Haiyan ^{[1
,2
]}

Harjo, Stefanus ^{[3
]}

Kawasaki, Takuro ^{[3
]}

Zhang, Fan ^{[4
]}

Wang, Bing ^{[1
]}

Lan, Si ^{[1
,5
]}

Wu, Zhenduo ^{[1
]}

Wu, Yuan ^{[4
]}

Lu, Zhaoping ^{[4
]}

Liu, Chain T. ^{[1
,6
,7
]}

Wang, Xun-Li ^{[1
,2
]}

机构：

[1] City Univ Hong Kong, Dept Phys, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

[2] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen Hitech Ind Pk, Shenzhen 518057, Peoples R China

[3] Japan Atom Energy Agcy, J PARC Ctr, Tokai, Ibaraki 3191195, Japan

[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[5] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Jiangsu, Peoples R China

[6] City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

[7] City Univ Hong Kong, Dept Mech Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

来源：

SCRIPTA MATERIALIA | 2020年 / 188卷

基金：

中国国家自然科学基金; 日本学术振兴会;

关键词：

High entropy alloy; Plastic deformation; Neutron diffraction; Dislocation density; Stacking faults; STACKING-FAULT ENERGY; MICROSTRUCTURE; EVOLUTION; DEPENDENCE; TENSILE; STRESS; METALS; SIZE;

D O I：

10.1016/j.scriptamat.2020.07.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching similar to 10(16) m(-2). In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength-ductility combination. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：21 / 25

页数：5

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