The sliding wear behaviour of CoCrFeMnNi and AlxCoCrFeNi high entropy alloys at elevated temperatures

By Jithin Joseph, N. Haghdadi, K. Shamlaye, Peter Hodgson, Matthew Barnett, D. Fabijanic. Wear, 2019

456 citations recorded by the source corpus.

Abstract High entropy alloys (HEAs) show promise as materials for structural applications, even at elevated temperatures. However, their wear behaviour over a wide range of temperatures has not been extensively studied. CoCrFeMnNi and AlxCoCrFeNi HEAs were subjected to pin-on-disc dry sliding wear at temperatures between 25 °C and 900 °C against an alumina ball, and the tribological performance benchmarked against AISI 304 and Inconel 718. A detailed characterisation of the wear tracks using electron microscopy and surface profilometry revealed a transition in wear mechanism from abrasive wear at room-temperature to oxidative and delamination wear above 600 °C. The wear performance of the HEAs, AlCoCrFeNi in particular, is substantially enhanced with increasing temperature, surpassing that of Inconel 718 at 900 °C. The enhanced wear performance of the HEAs above 600 °C is attributed to the formation of a compact oxide scale in the contact region, and relative subsurface strengthening in the form of a fine-grained recrystallised structure containing precipitation hardening phases.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e6029bd5595c050c9a2cc303ab6519e3990b742c

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Citations in the corpus

Review of Recent Research on AlCoCrFeNi High-Entropy Alloy (2021, background): “[66] investigated the sliding wear behavior of the AlxCoCrFeNi alloy from room temperature to temperature 900 ◦C.”
Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings (2021, background): “However, with increased Al content in cast AlxCoCrFeNi HEA (x ¼ 0.3, 0.5 and 0.7), a reduction in corrosion resistance was reported due to growth of a porous and thick aluminium oxide layer, which diminished the fraction of a more passive chromium oxide layer, resulting in deterioration of the alloy”