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Cr2AlC materials were irradiated with 7 MeV Xe26+ ions and 500 keV He2+ ionsat room temperature. A structural transition with an increased c latticeparameter and a decreased a lattice parameter occurs after irradiation to dosesabove 1 dpa. Nevertheless, the modified structure is stable up to the dose of5.2 dpa without obvious lattice disorder. The three samples irradiated to dosesabove 1 dpa have comparable lattice parameters and hardness values, suggestinga saturation of irradiation effects in Cr2AlC. The structural transition andirradiation effects saturation are ascribed to irradiation-induced antisitedefects (CrAl and AlCr) and C interstitials, which is supported by thecalculations of the formation energies of various defects in Cr2AlC. Theirradiation-induced antisite defects and C interstitials may be critical tounderstand the excellent resistance to irradiation-induced amorphization of MAXphases.

Saturation of ion irradiation effects in Cr2AlC