Extremely hard, α-Mn type high entropy alloy coatings

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.

Keywords

High entropy alloy coatings, Mechanical properties, Texture, Twin boundaries, α-MnBias voltage, Chromium alloys, Cobalt alloys, Crystal structure, Entropy, Grain refinement, Hard coatings, High speed steel, High-entropy alloys, Mechanical properties, Substrates, Textures, Bulk counterpart, Coating growth, Columnar grain, Cumulative effects, High speed steel substrate, Substrate bias voltages, Texture development, Twin boundaries, Manganese alloys

Document Type

Journal Article

Date of Publication

1-1-2020

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

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Link to publisher version (DOI)

10.1016/j.scriptamat.2019.12.029