Unveiling microstructural origins of the balanced strength-ductility combination in eutectic high-entropy alloys at cryogenic temperatures

被引：22

作者：

Li, Yi ^{[1
,2
,3
]}

Shi, Peijian ^{[1
,2
,3
,4
]}

Wang, Mingyang ^{[1
,2
,3
]}

Yang, Yinpan ^{[1
,2
,3
]}

Wang, Yan ^{[1
,2
,3
]}

Li, Yiqi ^{[1
,2
,3
]}

Wen, Yuebo ^{[1
,2
,3
]}

Ren, Weili ^{[1
,2
,3
]}

Min, Na ^{[5
]}

Chen, Yan ^{[6
]}

Guo, Yifeng ^{[1
,2
,3
]}

Shen, Zhe ^{[1
,2
,3
]}

Zheng, Tianxiang ^{[1
,2
,3
]}

Liang, Ningning ^{[7
]}

Lu, Wenjun ^{[8
]}

Liaw, Peter K. ^{[9
]}

Zhong, Yunbo ^{[1
,2
,3
]}

Zhu, Yuntian ^{[4
]}

机构：

[1] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China

[2] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200444, Peoples R China

[3] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China

[4] City Univ Hong Kong, Coll Sci & Engn, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Hong Kong, Peoples R China

[5] Shanghai Univ, Lab Microstruct, Shanghai, Peoples R China

[6] Carl Zeiss Shanghai Co Ltd, Shanghai, Peoples R China

[7] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China

[8] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen, Peoples R China

[9] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

MATERIALS RESEARCH LETTERS | 2022年 / 10卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Eutectic high-entropy alloys; mechanical properties; multi-slip scenario; compatible co-deformation; HDI hardening; SHORT-RANGE ORDER; DEFORMATION; FRACTURE;

D O I：

10.1080/21663831.2022.2078169

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Eutectic high-entropy alloys (EHEAs) feature attractive strength-ductility balance at both ambient and cryogenic temperatures. Nevertheless, microstructural origins underpinning these balanced mechanical properties remain elusive. Here the deformation mechanisms of a recently-reported Al19Co20Fe20Ni41 EHEA were comparatively investigated at 298 and 77 K, which revealed a high frequency and density of dislocation multi-slip scenario in the soft eutectic lamellae and the corresponding compatible co-deformation in the adjacent hard lamellae that collectively endowed strong hetero-deformation-induced (HDI) hardening and excellent forest-dislocation hardening. Therefore, better ductility and tensile strength, in comparison to the other widely-studied EHEA system, could be sustained even at liquid-nitrogen temperatures. IMPACT STATEMENT We identify a new eutectic HEA system with superior strength-ductility combination at liquid-nitrogen temperatures, and provide critical microstructural insights and mechanisms into its enhanced cryogenic properties.

引用

页码：602 / 610

页数：9

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