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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