Abstract
The deformation behavior in uniaxial compression of ultrafine-grained (UFG) pure Cu produced by severe plastic deformation through equal channel angular pressing (12 passes route C) with initial spacing of large angle grain boundaries of about 350 nm is compared to that of initially coarse-grained (CG) Cu with . UFG Cu attains its steady state of deformation within a small strain interval of about 0.05. CG Cu needs much larger strains to approach the steady-state flow stress (Voce stress) terminating stage III hardening and the final steady-state flow stress . The dependences of the steady-state flow stresses on strain rate and temperature differ significantly for UFG and CG Cu. In consequence, UFG Cu becomes softer in the steady state of deformation compared to CG Cu with regard to both as well as . This is explained in terms of annihilation of lattice dislocations at large-angle grain boundaries lowering the steady-state deformation resistance. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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