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|Title:||Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength|
|Citation:||Applied Physics Letters, 2018; 113(8):081905-1-081905-5|
|Yujie Chen, Zhifeng Zhou, Paul Munroe and Zonghan Xie|
|Abstract:||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 ∼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 face-centred-cubic structured counterpart. The formation and its role of the hierarchical nanostructure in producing such mechanical strength are discussed.|
|Rights:||© 2018 Author(s).|
|Appears in Collections:||Mechanical Engineering publications|
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