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During quasi-stationary tensile deformation of ultrafine-grained Cu-0.2 mass%Zr at 673   K    and a deformation rate of aboute - 4    /   s    load changes were performed. Reductions of relative load by more than about 25% initiate anelastic back flow. Subsequently, the creep rate turns positive again and goes through a relative maximum. This is interpreted by a strain rate componentϵ ˙  -associated with dynamic recovery of dislocations. Back extrapolation indicates thatϵ ˙  -contributes the same fraction of( 20 ± 10 ) %to the quasi-stationary strain rate that has been reported for coarse-grained materials with high fraction of low-angle boundaries; this suggests that dynamic recovery of dislocations is generally mediated by boundaries. The influence of anelastic back flow onϵ ˙  -is discussed. Comparison ofϵ ˙  -to the quasi-stationary rate points to enhancement of dynamic recovery by internal stresses. Subtraction ofϵ ˙  -from the total rate yields the rate componentϵ ˙  +related with generation and storage of dislocations; its activation volume is in the order expected from the classical theory of thermal glide.

metals

Strain Rate Contribution due to Dynamic Recovery of Ultrafine-Grained Cu–Zr as Evidenced by Load Reductions during Quasi-Stationary Deformation at 0.5 Tm