By using a time differential perturbed angular correlation method and 111In (which decayed to 111Cd), lattice defects which were introduced by cold rolling at 77K were studied by monitoring the magnetic hyperfine fields which were observed at the 111Cd probe nuclear sites. In order to investigate the effect of the annealing temperature, time differential perturbed angular correlation spectra were measured at 298K after 1h isochronal annealing at up to 1273K in an Ar-7%H2 gas atmosphere. After annealing at 1273K, only a single component (ωL = 98.0Mrad/s) corresponding to a magnetic hyperfine field of 6.68T was observed at 300K. This frequency was attributed to a hyperfine field at a 111Cd nucleus which occupied substitutional Ni lattice sites. After annealing at 473K, an ωL equal to 40.60Mrad/s (corresponding to a magnetic hyperfine field of 2.77T) was observed in addition to the component originating from substitutional 111Cd atoms. This frequency seemed to be due to a component arising from the trivacancy trapping site. This component disappeared after annealing at above 873K and, after annealing at 1273K, the spectrum completely returned to the original substitutional 111Cd spectrum before cold rolling.

111Cd Time Differential Perturbed Angular Correlation Study of Deformed Ni. K.Baba, S.Nasu, T.Ohtomo, S.Morimoto, T.Saito: Materials Transactions, 2002, 43[8], 2125-9