J. Phys. IV France
Volume 112, October 2003
Page(s) 385 - 388

J. Phys. IV France
112 (2003) 385
DOI: 10.1051/jp4:2003907

The characteristics of reversal transformation in Fe-Mn-Si-Cr-Ni shape memory alloys

Q. Liu1, C. Lin2, C. Wen2 and N. Gu2

1  Tianjin Institute of Technology, Department of Materials Science and Engineering, Tianjin 300191, China
2  Hebei University of Technology, School of Materials Science and Engineering, Hebei 300130, China

The transformation characteristics of stress induced $\varepsilon$ martensite with different structure in Fe-17Mn-10Cr-5Si-4Ni alloy has been systematically observed by TEM during heating course, and the reversal transformation of the stress induced $\varepsilon$ martensite has been analyzed simultaneously. It has been found that the reversal transformation is different for the $\varepsilon$ martensite with different structure. For the simple plate $\varepsilon$ martensite, its reversal transformation is of typical thermo-elastic, i.e. $\varepsilon$ martensite disappeared easily through the reversal movement of interface between $\varepsilon$ and $\gamma$, and the crystallographic reversibility is realized at the same time. For the $\varepsilon$ martensite with layered structure, the reversal transformation carried out independently on each layer. As for the wide $\varepsilon$ martensite strap, the reversal transformation is very difficult for its plastic accommodation in different parts, and the transformation hysteresis is very large.

© EDP Sciences 2003