Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 29-30, Pages 8621-8627Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.08.010
Keywords
Cu; Ultrafine grained (UFG); ECAP; Severe plastic deformation (SPD); Steady state; Grain size; Recovery
Categories
Funding
- Deutsche Forschungsgemeinschaft [Bl135/30]
- NSFC [50474028]
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Pure Cu was subjected to severe plastic predeformation by p = 1, 2, 4, 8, 16 and 24 passes of equal channel angular pressing (ECAP) on route B-C at ambient temperature and subsequently tested in uniaxial compression parallel to the extrusion direction at constant rate or constant stress and temperatures from ambient temperature up to 418 K. The maximum compressive strength of the ECAPed Cu varies in a systematic fashion with p, until a steady state is finally reached between p = 8 and 16 where the rate sensitivity of flow stress is maximal. The results are quantitatively interpreted in terms of the boundary structure, considering the superposition of hardening due to refinement of low-angle boundaries and softening due to enhanced thermal recovery at high-angle boundaries. Beyond the maximum the compressive strength declines with strain for relatively low rate and/or elevated temperature of compression. This is explained by dynamic grain coarsening towards the new steady state developing in compression. (C) 2011 Elsevier B.V. All rights reserved.
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