Document 
Eur. Phys. J. Special Topics 158, 107-112 (2008)
DOI: 10.1140/epjst/e2008-00661-7
Reversible and irreversible martensitic transformations in Fe-Pd and Fe-Pd-Co alloys
V. Sánchez-Alarcos1, V. Recarte1, J.I. Pérez-Landazábal1, C. Gómez-Polo1, V.A. Chernenko2 and M.A. González3, 41 Universidad Pública de Navarra (UPNA), Campus Arrosadia, 31006 Pamplona, Spain
2 Institute of Magnetism, NAS of Ukraine, 36-B Vernadsky Str., Kiev 03142, Ukraine
3 Institut Laue Langevin (ILL), 6 rue Jules Horowitz, Grenoble, France
4 Instituto de Ciencias de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
(Published online: 1 May 2008)
Abstract
Ferromagnetic Fe-Pd shape memory alloys (SMA) undergo a
martensitic phase transformation during cooling from a parent FCC phase to a
tetragonal FCT martensite. This transformation is thermoelastic and
reversible giving rise to the shape memory effect. On further cooling an
irreversible FCT to BCT transformation occurs that makes impossible the
memory effect. Nevertheless, the transformation from reversible to
irreversible phase has been not complete since a volume fraction of
reversible phase in the alloy is retained even after cooling below the
temperature of appearance of the irreversible phase. The addition of Co
lowers the temperature of the reversible and irreversible phase
transformations but also reduces the amount of transformed irreversible
martensite after cooling to 10 K.
© EDP Sciences, Springer-Verlag 2008