Hydrogen embrittlement of an interstitial equimolar high-entropy alloy

Luo, H. and Li, Z. and Lu, W. and Ponge, D. and Raabe, D.

Volume: 136 Pages: 403-408
DOI: 10.1016/j.corsci.2018.03.040
Published: 2018

We investigated the hydrogen embrittlement mechanism in an interstitially carbon alloyed equimolar CoCrFeMnNi high-entropy alloy (HEA) through low strain rate tensile testing under in-situ hydrogen charging. The tensile ductility was significantly reduced by hydrogen charging. The failure mode of the interstitial HEA in presence of hydrogen was a combination of intergranular and transgranular fracture as well as microvoid coalescence. Aggregated nano-carbides act as potential sites for crack initiation. These findings show that the carbon alloyed equimolar high-entropy alloy is susceptible to hydrogen embrittlement. © 2018 Elsevier Ltd

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