| Issue |
J. Phys. IV France
Volume 112, October 2003
|
|
|---|---|---|
| Page(s) | 1083 - 1086 | |
| DOI | https://doi.org/10.1051/jp4:20031070 | |
J. Phys. IV France 112 (2003) 1083
DOI: 10.1051/jp4:20031070
Twin/domain pattern memory in aged Au-49.5Cd martensite
X. Ren1, 2, K. Otsuka3, A. Matsushita1 and M. Nakamura11 Materials Physics Group, National Institute for Materials Science, Tsukuba 305-0047, Japan
2 Japan Science and Technology Corporation (JST), Saitama, Japan
3 Nationallnstitute for Materials Science (NIMS), Advanced Materials Laboratory, 1-1 Namiki, Tsukuba 305-0044, Japan
Abstract
We performed in-situ optical microscopy observations on a Au-49.5Cd single crystal during heatinglcooling and tensile loading/unloading
runs. We found that for aged martensite domain pattern can be reproduced or memorized during heating/cooling or stress loading/unloading
runs. This mesoscopic memory effect contradicts the basic notion of martensitic transformation that variants/domains are crystallographically
and energetically equivalent. It points to the interaction of point defects with martensitic transformation. We show that
the interesting mesoscopic memory effect can be fully explained by a general symmetry property of point defects, the symmetry-conforming
short-range order property (Ren and Otsuka, Nature, 1997).
© EDP Sciences 2003