Radiation Hardening of Ni-Ti Alloy Under Implantation of Inert Gases Heavy Ions

Abstract

The consistent patterns of changes in nano- and micro-hardness of Ni-Ti alloy with the shape memory effect after implantation of [40]Ar{8+} and [84]Kr{15+} ions depending on phase composition and implantation parameters have been experimentally studied. It has been shown that softening by 4 and 14% near the surface of the two-phase Ni-Ti alloy after implantation of [40]Ar{8+} and [84]Kr{15+} ions is connected with the differences in the nanostructure. Hardening of the near-surface layer of this alloy maximum by 118% at h=~3 pm and single-phase alloy in the entire region of the [40]Ar{8+} and [84]Kr{15+} ions range and in the out-range (h>R[p]) area have been detected. The role of the current intensity of the ions beam in the change of nanohardness for the two-phase Ni-Ti alloy has been established.