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https://hdl.handle.net/2440/125440
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Type: | Journal article |
Title: | High entropy alloy FeMnNiCoCr coatings: enhanced hardness and damage-tolerance through a dual-phase structure and nanotwins |
Author: | Sha, C. Zhou, Z. Xie, Z. Munroe, P. |
Citation: | Surface and Coatings Technology, 2020; 385:125435-1-125435-11 |
Publisher: | Elsevier |
Issue Date: | 2020 |
ISSN: | 0257-8972 1879-3347 |
Statement of Responsibility: | Chuhan Sha, Zhifeng Zhou, Zonghan Xie, Paul Munroe |
Abstract: | Three FeMnNiCoCr high entropy alloy (HEA) coatings were deposited onto M2 steel substrates using a direct current (DC) magnetron sputtering system under a range of substrate bias voltages (−20 V, −60 V and −120 V). The microstructure transformed from a fine elongated structure to coarse V-shaped columnar grains with increasing substrate bias voltage. A high density of nanotwins, together with the presence of a partial fcc-to-hcp transformation, was observed in the coating deposited at −120 V. This was attributed to the introduction of stacking faults whose presence was promoted by preferential re-sputtering effects during the deposition process. A high hardness value of ~9.1 GPa, accompanied by exceptional damage-tolerance, was achieved in the coating deposited at −120 V. Here, the formation of nanotwins and the dual-phase structure was found to contribute to this remarkable combination of hardness and resistance to plastic deformation. |
Keywords: | High entropy alloy; nanotwins; dual phase; hardness; damage tolerance |
Rights: | © 2020 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.surfcoat.2020.125435 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150102417 |
Published version: | http://dx.doi.org/10.1016/j.surfcoat.2020.125435 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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