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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
Statement of
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.
RMID: 1000014414
DOI: 10.1016/j.surfcoat.2020.125435
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Appears in Collections:Physics publications

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