Reversible and irreversible martensitic transformations in Fe-Pd and Fe-Pd-Co alloys

Vicente Sanchez-Alarcos 1Vicente Recarte 1José Ignacio Pérez-Landazábal 1Cristina Gomez-Polo 1Volodymyr A. Chernenko 2Miguel A. Gonzalez 3,4

1. Universidad Pública de Navarra (UPNA), Campus Arrosadia, Pamplona 31006, 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,CSIC-Universidad de Zaragoza de Aragón (ICMA), Zaragoza 50009, Spain

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 and has associated the shape memory effect. On further cooling an irreversible FCT to BCT transformation occurs that destroys the memory effect. Nevertheless, the transformation from reversible to irreversible phase is not complete since a volume fraction of the alloy is retained in the reversible phase even if the sample has been cool down well below the irreversible limit.
In this work, the changes in the magnetic susceptibility and the evolution of the neutron powder diffraction patterns have been analyzed in order to study the phase changes occurring during cooling in two different Fe-Pd and Fe-Pd-Co alloys. The addition of Co reduces the temperature of the reversible and irreversible phase transformation but also reduces the amount of transformed irreversible martensite after cooling to 10 K.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium E, by Vicente Recarte
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-14 12:33
Revised:   2009-06-07 00:44