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Xiao et al. Microstructures 2023;3:2023006 https://dx.doi.org/10.20517/microstructures.2022.26 Page 5 of 17
Figure 3. Superior tensile properties and deformation microstructures of hydrogen charged 97(CoCrNi)-3Mo samples. (A) Engineering
stress-strain curves of Mo-doped and undoped CoCrNi alloys with and without hydrogen. (B and C) Microstructures of hydrogen-
charged 97(CoCrNi)-3Mo alloy near the fracture surface showing high-density NTs. Note that hydrogen charging was performed in a
100 MPa hydrogen gas environment at 200 °C for a duration of 160 h (Reproduced with permission [55] . Copyright 2021, Elsevier). NTs:
Nanotwins.
Figure 4. Hydrogen-induced phase transformations and schematic overview of metastable 45Fe-35Mn-10Co-10Cr HEA. (A-C) Electron
backscatter diffraction (EBSD) phase maps of no-hydrogen charging after 55 h of hydrogen charging and 106 h of hydrogen charging.
(D) Image quality map of a hydrogen-charged sample for 106 h. (E) Enlarged region with hydrogen-induced twins is highlighted in red.
[28]
(F) Point-to-point misorientation across a hydrogen-induced twin .
