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Figure 5. Tensile mechanical responses and corresponding micro-mechanisms of stable and metastable HEAs under gas hydrogen charging conditions. (A and B) Engineering stress-strain curves of stable and metastable HEAs with and without hydrogen. (C-F) Surface cracks and associated EBSD images of metastable HEA (Reproduced with permission^[60]. Copyright 2018, Elsevier). HEAs: High entropy alloys.