Abstract
Specimens prepared from recrystallized commercially pure molybdenum were crept at constant temperature under various loading conditions. Sudden stress changes were made and the following creep behaviour was observed: an increase in stress was followed by primary creep while a decrease in stress was followed by inverted primary creep. Transmission electron microscopy examination of the microstructure revealed that sudden changes in stress are accompanied by changes in both subgrain size d and the distribution function F(ω) of the misorientation angle of the subgrains. It was shown that the microstructure dependence of the creep rate can be expressed in terms of a structural parameter, the effective subgrain size d eff.
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