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

Materials Research Letters

Na Min¹  Wenjun Lu¹  Yuntian Zhu¹  Mingyang Wang¹  Zhe Shen¹  Yiqi Li¹  Peijian Shi²  Ningning Liang²  Yunbo Zhong²  Yan Wang²  Weili Ren²  Yifeng Guo²  Peter K. Liaw³  Tianxiang Zheng³  Yuebo Wen³  Yinpan Yang³  Yi Li³  Yan Chen³ 

[1] School of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of China;;Shanghai Key Laboratory of Advanced Ferrometallurgy &;State Key Laboratory of Advanced Special Steel &

关键词: Eutectic high-entropy alloys;    mechanical properties;    multi-slip scenario;    compatible co-deformation;    HDI hardening;   

DOI  :  10.1080/21663831.2022.2078169

来源: DOAJ

【 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.

【 授权许可】

Unknown