Effect of pre-strain on hydrogen embrittlement of 7075 aluminum alloy and molecular dynamics simulation

YH Wang and JY Liu and ZR Wang and FS Du, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 88, 626-637 (2024).

DOI: 10.1016/j.ijhydene.2024.08.496

In this study, the effect of dislocation and grain boundary (GB) on hydrogen embrittlement of aluminum alloys was investigated using pre- strain and molecular dynamics (MD). Hydrogen increased the yield strength (YS) and ultimate tensile strength (UTS) of pre-strain alloys. MD simulations revealed that hydrogen enhance the critical resolved shear stress (CRSS) for dislocation, and hydrogen segregation GB reduce material strength. The YS and UTS of Al alloys are affected by both mechanisms during deformation, and the two mechanisms exhibit a competitive relationship. Hydrogen enhanced CRSS dominates in higher dislocation density deformations.

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