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Type: Journal article
Title: Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength
Author: Chen, Y.
Zhou, Z.
Munroe, P.
Xie, Z.
Citation: Applied Physics Letters, 2018; 113(8):081905-1-081905-5
Publisher: AIP Publishing
Issue Date: 2018
ISSN: 0003-6951
Statement of
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).
RMID: 0030096875
DOI: 10.1063/1.5042148
Appears in Collections:Mechanical Engineering publications

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