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Published February 1996 | public
Journal Article

Symmetry, texture and the recoverable strain of shape-memory polycrystals


Shape-memory behavior is the ability of certain materials to recover, on heating, apparently plastic deformation sustained below a critical temperature. Some materials have good shape-memory behavior as single crystals but little or none as polycrystals, while others display good shape-memory behavior even as polycrystals. In this paper, we propose a theoretical explanation for this difference: we show that the recoverable strain in a polycrystal depends on the texture of the polycrystal, the transformation strain of the underlying martensitic transformation and especially on the change of symmetry during the underlying transformation. Roughly, we find that the greater the change in symmetry during transformation, the greater the recoverable strain. We include an extensive survey of the experimental literature and show that our results agree with these observations. We make recommendations for improved shape-memory effect in polycrystals.

Additional Information

© 1996 Published by Elsevier Ltd. Acta Metallurgica Inc. Received 13 February 1995; in revised form 13 April 1995. Some of this research was conducted while KB held a post-doctoral position at the Courant Institute. This work was partially supported by grants from the ARO (KB and RVK), NSF (KB and RVK), ONR (KB) and the Powell Foundation (KB).

Additional details

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