Effect of the chemical composition on amorphization of titanium-nickelide-based alloys with fast neutrons

The structural state of a Ti$_{50}$Ni$_{47}$Fe$_3$ single crystal irradiated with fast neutrons ($F$ = 2.5 $\times$ 10$^{20}$ cm$^2$) at a temperature of 340 K was studied using thermal neutron diffraction. The alloy of this chemical composition was chosen in searching for a radiation-resistant shape memory material. It is established that this alloy retains its crystalline state after irradiation, whereas the Ti$_{49}$Ni$_{51}$ crystal studied previously is completely amorphized after similar irradiation. A detailed analysis of the structural state of the irradiated ternary alloy allowed us to discover the main physical causes of its radiation resistance.