A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion

Hong Luo(Max-Planck-Institut für Nachhaltige Materialien), Seok Su Sohn(Korea University), Wenjun Lu(Max-Planck-Institut für Nachhaltige Materialien), Linlin Li(Max-Planck-Institut für Nachhaltige Materialien), Xiaogang Li(Beijing University of Technology), Chandrahaasan K. Soundararajan(Max-Planck-Institut für Nachhaltige Materialien), Waldemar Krieger(Max-Planck-Institut für Nachhaltige Materialien), Zhiming Li(Central South University), Dierk Raabe(Max-Planck-Institut für Nachhaltige Materialien)
Nature Communications
June 17, 2020
10.1038/s41467-020-16791-8
Cited by 298Open Access
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Abstract

Abstract Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a strong and ductile CoNiV medium-entropy alloy with face-centered cubic structure. It shows high resistance to hydrogen embrittlement at ambient temperature at a strain rate of 10 −4 s −1 , due to its low hydrogen diffusivity and the deformation twinning that impedes crack propagation. Moreover, a dense oxide film formed on the alloy’s surface reduces the hydrogen uptake rate, and provides high corrosion resistance in dilute sulfuric acid with a corrosion current density below 7 μA cm −2 . The combination of load carrying capacity and resistance to harsh environmental conditions may qualify this multi-component alloy as a potential candidate material for sustainable and safe infrastructures and devices.

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