Abstract
In many alloys a change in the stress exponent with stress has been reported. In the low stress region, the stress exponent n is equal to 5; in the intermediate stress region, n = 3; in the high stress region, n = 5. Dislocations are distributed homogeneously in the specimen which has been subjected to creep in the region where the stress exponent n is 3, and dislocation tangles are formed in the high stress region with n = 5. In this paper, attempts are made to explain the change in the stress exponent with stress and magnesium content in terms of dynamic strain aging. The change in the stress exponent is attributed to the contribution to the stress exponent from dynamic strain aging. The equations for the creep rate and the stress exponent derived in this paper are in good agreement with the published data available. The change in the dislocation substructure with stress can also be explained in terms of dynamic strain aging.
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