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A Study of the Rubber-Like Behavior of Mono-Domain Au-Cd Martensite

Published online by Cambridge University Press:  10 February 2011

Xiaobing Ren  and
Kazuhiro Otsuka
Xiaobing Ren
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan, ren@mat.ims.tsukuba.ac.jp
Kazuhiro Otsuka
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan, ren@mat.ims.tsukuba.ac.jp
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Abstract

The origin of the rubber-like behavior in mono-domain Au-Cd martensite was explained in terms of a new model that focused attention on the change of long-range elastic interaction energy among vacancies during a domain reversion. Vacancies in martensite, the lower-symmetry phase, produce stress fields with lower symmetry. During martensite aging, vacancies tend to rearrange themselves to lower elastic interaction energy. The low-symmetry elastic field results in a low-symmetry vacancy configuration. When a stabilized martensite domain reverts to a new domain (twin) under external stress, the original vacancy configuration is inherited to the new domain, but such a configuration becomes a high energy configuration because of the lower symmetry of elastic field, and thus it tends to restore the original configuration by reverse twinning. The above vacancy reconfiguration model is consistent with the fact that the rubber-like behavior is closely related to vacancies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 305
Copyright
Copyright © Materials Research Society 1997

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References

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