Title

Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength

Document Type

Journal Article

School

School of Engineering

Comments

Originally published as : 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. Article can be found 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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