Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength

Document Type

Journal Article

Publication Title

Applied Physics Letters

School

School of Engineering

RAS ID

27905

Comments

Chen, Y., Zhou, Z., Munroe, P., & Xie, Z. (2018). Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength. Applied Physics Letters, 113(8), 081905. Available here

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.

DOI

10.1063/1.5042148

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