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On the role of deformation twinning in domain reorganization and grain reorientation in ferroelastic crystals

Published online by Cambridge University Press:  31 January 2011

Peter Müllner  and
Waltraud M. Kriven
Peter Müllner
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, 105 South Goodwin Avenue, Urbana, Illinois 61801
Waltraud M. Kriven
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, 105 South Goodwin Avenue, Urbana, Illinois 61801
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Abstract

The response of ferroelastic crystals on an applied stress is considered, and a distinction is seen between the reorganization of the domain structure within a grain at low stress and the reorientation of whole grains at high stress. The procedures are modeled in the framework of defect theory, i.e., by twinning dislocations and deformation twinning. The reorganization is controlled by the motion of pre-existing twinning dislocations. Since the Peierls stress of the twinning dislocations is very small, domain reorganization occurs under a very small load. The process of grain reorientation involves the nucleation of dislocations and, therefore, it requires a much higher stress. This concept is confirmed by comparison with experiments.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 7 , July 1997 , pp. 1771 - 1776
Copyright
Copyright © Materials Research Society 1997

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