Samples which were doped with 0.2at%B were cold-rolled to 40%, and were annealed (835C, 1h) in order to develop grain-boundary bulges. The positions of the bulges were monitored, as a function of time, during isothermal annealing at 835, 850, 875, 900 and 848C. It was noted that the initial migration rate increased with increasing temperature. However, the displacement of the bulge increased with decreasing rate at all temperatures. This was attributed to a simultaneous recovery of strained regions of the material during boundary migration. An analysis of the results showed that the experimental data agreed well with theory. The activation energy for recovery was 463kJ/mol, as compared with the activation energy (317kJ/mol) for boundary migration.

Strain-Induced Grain-Boundary Migration in Boron-Doped Ni76Al24 M.C.Chaturvedi, R.K.Verma, A.K.Jena: Materials Science and Technology, 1998, 14[8], 743-8