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How Do Martensitic Twin Boundaries Move?

Published online by Cambridge University Press:  01 February 2011

Graeme J. Ackland  and
Udomsilp Pinsook
Graeme J. Ackland
Affiliation:
Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 2LZ, UK
Udomsilp Pinsook
Affiliation:
Department of Physics, Chulalongkorn University, Bangkok, 10330, Thailand.
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Abstract

The martensitic phase transformation from bcc to hcp underlies a number of curious effects, including shape-memory and superelasticity. The distinctive feature is the microscopic reversibility of the transition: at the atomic level, the position of each atom is uniquely related between phases. Moreover, this one-to-one relationship holds not only for the perfect crystal transformation mechanism, but also for the topological defects (such as twin boundaries) which are created in the transformation. Furthermore, for shape memory effect the microscopic relationship must be preserved by the deformation mechanism active in the material. In this paper, we examine the microscopic phenomena which allow these relationships to hold, and the consequences for shape-memory alloy design.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 731: Symposium W – Modeling and Numerical Simulation of Materials Behavior and Evolution , 2002 , W8.20
Copyright
Copyright © Materials Research Society 2002

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References

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