Unveiling microstructural origins of the balanced strength–ductility combination in eutectic high-entropy alloys at cryogenic temperatures. Issue 9 (2nd September 2022)

• Record Type: Journal Article
• Authors: Li, Yi; Shi, Peijian; Wang, Mingyang; Yang, Yinpan; Wang, Yan; Li, Yiqi; Wen, Yuebo; Ren, Weili; Min, Na; Chen, Yan; Guo, Yifeng; Shen, Zhe; Zheng, Tianxiang; Liang, Ningning; Lu, Wenjun; Liaw, Peter K.; Zhong, Yunbo; Zhu, Yuntian
• Is Part Of: Materials research letters. Volume 10:Issue 9(2022)
• Page Start: 602
• Page End: 610
• Publication Date: 2022-09-02
• Subjects: Eutectic high-entropy alloys -- mechanical properties -- multi-slip scenario -- compatible co-deformation -- HDI hardening; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2022.2078169
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : 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 Al19 Co20 Fe20 Ni41 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. GRAPHICAL ABSTRACT: UF0001 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.