Abstract
Logarithmic stress-relaxation in α-uranium strips extended up to 5% at 200°–386°K is shown to be controlled by a mechanism with an energy barrier of 1.0 eV, numerically equal to about 0.57 times the activation energy of self-diffusion. This result, in conjunction with analyses of the kinetics of debris formation by moving dislocations, as observed in thin foils of the metal by electron transmission microscopy, is consistent with a model in which relaxation arises from residual glide of screw dislocations in the prominent (010)[100] glide system, the dislocations being subjected to a frictional drag by vacancy generating jogs of the 1 2 [110] type.
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