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.
| Original language | English |
|---|---|
| Article number | 081905 |
| Journal | Applied Physics Letters |
| Volume | 113 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 20 Aug 2018 |
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yujie Chen, Zhifeng Zhou, Paul Munroe, and Zonghan Xie , "Hierarchical nanostructure of CrCoNi film underlying its remarkable mechanical strength", Appl. Phys. Lett. 113, 081905 (2018) and may be found at https://doi.org/10.1063/1.5042148.
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