Extremely hard, α-Mn type high entropy alloy coatings

Document Type

Journal Article

Publication Title

Scripta Materialia

Publisher

Elsevier

School

School of Engineering

RAS ID

32475

Funders

Australian Research Council

Grant Number

ARC Number : DP150102417

Comments

Sha, C., Zhou, Z., Xie, Z., & Munroe, P. (2020). Extremely hard, α-Mn type high entropy alloy coatings. Scripta Materialia, 178, 477-482. https://doi.org/10.1016/j.scriptamat.2019.12.029

Abstract

FeMnCoCrC high entropy alloy coatings were deposited onto high speed steel substrates using magnetron sputtering under a range of substrate bias voltages. These coatings exhibited a novel α-Mn crystal structure and highly refined columnar grains. Higher bias voltages promoted strong texture development through favouring (332)-oriented grains along the coating growth direction, as well as the formation of well-defined twin boundaries. The -80 V coating possessed a high hardness (~12.5 GPa), more than triple that of its fcc-structured bulk counterpart. This is attributed to the cumulative effects of the α-Mn structure, strong texture, grain refinement and the presence of twin boundaries.

DOI

10.1016/j.scriptamat.2019.12.029

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