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Quasi-Stationary Strength of ECAP-Processed Cu-Zr at 0.5 Tm

1
Department of Materials Science, Institute I, University of Erlangen-Nuremberg, Martensstr. 5, D-91058 Erlangen, Germany
2
Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, CZ-616 62 Brno, Czech Republic
3
Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1149; https://doi.org/10.3390/met9111149
Received: 5 September 2019 / Revised: 18 October 2019 / Accepted: 21 October 2019 / Published: 26 October 2019
(This article belongs to the Special Issue Dislocation Mechanics of Metal Plasticity and Fracturing)
The influence of the grain structure on the tensile deformation strength is studied for precipitation-strengthened Cu-0.2%Zr at 673K. Subgrains and grains are formed by equal channel angular pressing (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 a result of the stress dependences of the quasi-stationary subgrain size and the volume fraction of subgrain-free grains. View Full-Text
Keywords: Cu-Zr; ECAP; deformation; quasi-stationary; subgrains; grains; coarsening Cu-Zr; ECAP; deformation; quasi-stationary; subgrains; grains; coarsening
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Blum, W.; Dvořák, J.; Král, P.; Eisenlohr, P.; Sklenička, V. Quasi-Stationary Strength of ECAP-Processed Cu-Zr at 0.5 Tm. Metals 2019, 9, 1149.

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