Abstract
Harper–Dorn creep refers to the anomalous creep behavior first reported in 1957 by Harper and Dorn in their study on the creep behavior of large-grained aluminum. The creep rates associated with Harper–Dorn creep are two orders of magnitude faster than those predicted by Nabarro–Herring creep (diffusional creep). The present investigation provides new evidence that dynamic recrystallization occurs during Harper–Dorn creep. Such evidence is manifested by the occurrence of periodic accelerations of the creep rate. In addition, it is shown that the creep substructure along with other considerations is consistent with the characteristics of dynamic recrystallization.
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