The consistent patterns of changes in structural and phase state, hardening and temperature ranges of martensitic transformations in Ni-Ti alloy with the shape memory effect after implantation of heavy ions _(16)O~(3+), _(40)Ar~(8+) and _(84)Kr~(15+) under comparable parameters have been experimentally studied. It is found that under the impact of _(84)Kr~(15+) ions, a two-layer surface structure with radiation-hardened second layer is formed, radiation-stimulated phase transformation B19'→B2 occurs in the near-surface layer and out-range area, and the martensitic transformation temperature increases toward higher values after implantation of _(40)Ar~(8+) and _(84)Kr~(15+) ions.
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