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https://hdl.handle.net/2440/114738
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Type: | Journal article |
Title: | Microstructure and mechanical properties of a multilayered CoCrNi/Ti coating with varying crystal structure |
Author: | Cao, F. Munroe, P. Zhou, Z. Xie, Z. |
Citation: | Surface and Coatings Technology, 2018; 350:596-602 |
Publisher: | Elsevier BV |
Issue Date: | 2018 |
ISSN: | 0257-8972 1879-3347 |
Statement of Responsibility: | Fuyang Cao, Paul Munroe, Zhifeng Zhou, Zonghan Xie |
Abstract: | Medium entropy alloys (MEAs), such as CoCrNi, have been demonstrated to combine high hardness and excellent ductility, thereby outperforming many high entropy alloys reported to date. In this study, a multilayered CoCrNi/Ti coating was deposited onto a M2 steel substrate using a DC magnetron sputtering system. Columnar grains can be observed in both the CoCrNi and Ti layers. A high density of periodic twin boundaries, aligned in a direction normal to the growth direction, was also observed within the columnar CoCrNi grains. Moreover, different crystal structures were identified for different CoCrNi layers. The outermost CoCrNi layer exhibited a FCC structure, whilst in contrast, both the middle and bottom CoCrNi layers exhibited a BCC structure. It was assumed that Shockley partial dislocations were responsible for the FCC to BCC transition occurring in both the bottom and middle CoCrNi layers. A high hardness of ~7.6 GPa and elastic modulus of ~233 GPa were determined for this multilayered coating by nanoindentation testing. Further, extraordinary damage tolerance was found in the multilayered CoCrNi/Ti coating under indentation loading. The steady shear banding behaviour during deformation may benefit energy dissipation and promote structural plasticity. |
Keywords: | CoCrNi; multilayer; nanotwinned structure; shear banding; damage tolerance |
Description: | Available online 20 July 2018 |
Rights: | © 2018 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.surfcoat.2018.07.066 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150102417 |
Published version: | http://dx.doi.org/10.1016/j.surfcoat.2018.07.066 |
Appears in Collections: | Aurora harvest 8 Mechanical Engineering publications |
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