Influence of Hydrogen at the Interface on Tensile Properties of Equiatomic FeCrNiMnCo High-Entropy Alloy

This study reports the effect of the hydrogen's position in the lattice on the tensile properties of FeCrNiMnCo high-entropy alloy. We reveal that the hydrogen at the interface is the main factor affecting the mechanical properties of the material. We found that hydrogen alloying with a proper concentration makes the alloy resistant to hydrogen embrittlement and improves the strength and ductility of the material. This beneficial effect is positively correlated with the hydrogen concentration at the interface of the alloy, with hydrogen promoting the formation of nanotwins, which are excessively compensatory to the surface cracks introduced by the hydrogen.