MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Formation of Deformation Twins and Related Shear Bands in a Copper Single Crystal Deformed by Equal-Channel Angular Pressing for One Pass at Room Temperature
Hiroyuki MiyamotoAlexei VinogradovSatoshi HashimotoRika Yoda
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2009 Volume 50 Issue 8 Pages 1924-1929

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Abstract

Deformation twinning, which is extremely difficult to produce in face-centered cubic (FCC) crystals with medium to high stacking fault energy (SFE), was observed in pure copper single crystals with an appropriate crystallographic orientation subjected to equal-channel angular pressing (ECAP) for one pass at room temperature. Dense shear bands were also observed, delineated by large-angle grain boundaries, and with close to a twinning relation with the matrix, suggesting the role of deformation twinning at their nucleation sites. The activation of deformation twinning is rationalized by a favorable crystallographic orientation and predominant dislocation density in a primary slip system.

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© 2009 The Japan Institute of Metals and Materials
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