A new method was introduced for the evaluation of the generation rate of dislocations during creep, by means of dynamic internal friction. As an example, the generation rate of dislocations in monocrystalline pure Al during creep at an homologous temperature of about 0.5 was evaluated. The generation rate was found to increase rapidly with creep time in the early stages of primary creep, to attain a maximum in the later stages of primary creep, and to decrease gradually to a stationary value during steady-state creep. It was noted that decreasing the creep stress resulted in a decrease in the dislocation generation rate and a shift in the peak level of the generation rate to longer times. The order of magnitude of the dislocation generation rate, and its variation with creep time, were found to be reasonable.

H.Zhou, Q.P.Kong: Scripta Materialia, 1996, 34[2], 269-74