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Figure 2. Tensile properties and associated mechanisms of equiatomic CoCrNi MEA under different hydrogen-charged conditions. (A) Engineering stress-strain curves under electrochemical charging. (B) Electron channeling contrast images of samples at 60% local strain levels with 5 d (52.78 wt. ppm) of hydrogen charging showing high-density NTs (Reproduced with permission^[51]. Copyright 2020, Elsevier). (C) Engineering stress-strain curves of undoped and boron-doped CoCrNi MEAs under gas hydrogen charging. (D and E) Detailed reconstruction and one-dimensional composition profiles of boron-doped (400 at. ppm) CrCoNi alloy using 0.4 at.% Bisosurface^[49]. MEA: Medium entropy alloy; NTs: nanotwins.