Blum, W.; Dvořák, J.; Král, P.; Eisenlohr, P.; Sklenička, V. Quasi-Stationary Strength of ECAP-Processed Cu-Zr at 0.5Tm. Metals2019, 9, 1149.
Blum, W.; Dvořák, J.; Král, P.; Eisenlohr, P.; Sklenička, V. Quasi-Stationary Strength of ECAP-Processed Cu-Zr at 0.5Tm. Metals 2019, 9, 1149.
The influence of the grain structure on the tensile deformation strength is studied for precipitation-strengthened Cu-0.2%Zr at 673 K. Subgrains and grains are formed by ECAP and annealing. The fraction of high-angle boundaries increases with prestrain. Subgrains and grains coarsen during deformation. This leads to softening in the quasi-stationary state. The initial quasi-stationary state of severely predeformed, ultrafine-grained material exhibits relatively high rate-sensitivity at relatively high stresses. This is interpreted as result of the stress dependences of the quasi-stationary subgrain size and the volume fraction of subgrain-free grains.
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