Preprint Article Version 1 This version is not peer-reviewed

Quasi-stationary Strength of ECAP-processed Cu-Zr at 0.5Tm

Version 1 : Received: 5 September 2019 / Approved: 6 September 2019 / Online: 6 September 2019 (12:15:47 CEST)

How to cite: Blum, W.; Dvorak, J.; Kral, P.; Eisenlohr, P.; Sklenicka, V. Quasi-stationary Strength of ECAP-processed Cu-Zr at 0.5Tm. Preprints 2019, 2019090073 (doi: 10.20944/preprints201909.0073.v1). Blum, W.; Dvorak, J.; Kral, P.; Eisenlohr, P.; Sklenicka, V. Quasi-stationary Strength of ECAP-processed Cu-Zr at 0.5Tm. Preprints 2019, 2019090073 (doi: 10.20944/preprints201909.0073.v1).

Abstract

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.

Subject Areas

Cu-Zr; ECAP; deformation; quasi-stationary; subgrains; grains; coarsening

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