Pinning in the irradiated superconducting alloys of Ti-50 wt% Nb

By measuring mechanical forces acting on a superconducting sample in magnetic field at H > or approximately HsUb(k1) the pinning volume force Fsub(p)(H) in Ti - 50 wt.% Nb alloys With different preliminary thermomechanical treatment that subsequently is subjected to reactor irradiation by 3X1018 cm-2 fast neutron fluence at 160 K is studied. It is shown that in fields at H > 1.2 kOe Fsub(p) has large values in aged samples containing α-Ti phase precipitations of approximately 100 A size and relatively low ones in cold-worked and recrystallized samples. It is also shown that both low-temperature irradiation and subsequent annealing at 300 K mainly lead to the Fsub(p) decrease in all the tested samples