Abstract
The influence of dynamic strain aging on the apparent activation energy for the creep of Zircaloy-2 is examined on the basis of the published data available. The expression for the apparent activation energy in the temperature range where dynamic strain aging occurs is given in terms of the solute strengthening term σ D due to dynamic strain aging. The equation produces realistic simulations of the negative apparent activation energy and the peak in apparent activation energy observed in Zircaloy-2. The negative apparent activation energy and the peak result from the strong temperature dependence of the solute strengthening term due to dynamic strain aging.
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