Fifth European Symposium on Martensitic Transformations and Shape Memory Alloys
J. Phys. IV France 11 (2001) Pr8-229-Pr8-234
DOI: 10.1051/jp4:2001839
The phase stability of ε-Fe alloys
M. Acet, H. Herper, P. Entel and E.F. WassermannTieftemperaturphysik, Gerhard-Mercator Universität Duisburg, 47048 Duisburg, Germany
Abstract
The hexagonal close packed €-phase of Fe, which is of particular interest in the study of shape memory effects in some Fe-based alloys, can be stabilized in pure Fe under a pressure of about 11 GPa. Also, Fe will be in the €-phase in the absence of ferromagnetic correlations in the α-phase. Therefore, an alternative to applying pressure to stabilize the €-phase is to destroy the long range ferromagnetic ordering in α-Fe by alloying appropriate elements. In this study we discuss the relationship of the magnetic properties and the stability of the €-phase in Fe and Fe-rich alloys with the aid of thermodynamical considerations and total energy calculations.
© EDP Sciences 2001