Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength

被引：24

作者：

Chen, Yujie ^{[1
]}

Zhou, Zhifeng ^{[2
]}

Munroe, Paul ^{[3
]}

Xie, Zonghan ^{[1
,4
]}

机构：

[1] Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, Australia

[2] City Univ Hong Kong, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

[3] UNSW, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[4] Edith Cowan Univ, Sch Engn, Perth, WA 6027, Australia

来源：

APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 08期

基金：

澳大利亚研究理事会;

关键词：

HIGH-ENTROPY ALLOY; STACKING-FAULTS; DEFORMATION MECHANISMS; EVOLUTION;

D O I：

10.1063/1.5042148

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A CrCoNi medium entropy alloy thin film is fabricated using magnetron sputtering. It exhibits a unique hierarchical nanostructure, featuring (1) a high density of planar defects (mostly stacking faults plus a small number of twin boundaries), (2) a dual-phase configuration (a mix of face-centred- cubic and hexagonal-close-packed), and (3) vertically aligned, textured nanocolumns, each with a width of similar to 100 nm. The hierarchical nanostructure in this study is original, especially for its dual phase combination, since the bulk CrCoNi medium entropy alloy generally presents a single phase face-centred-cubic structure. The CrCoNi film shows a hardness quadruple that of its facecentred- cubic structured counterpart. The formation and its role of the hierarchical nanostructure in producing such mechanical strength are discussed. Published by AIP Publishing.

引用

页数：5

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