Superelasticity of micropillar of single crystalline Fe3Pt

Abstract Mechanical behaviors of partly ordered (S~0.75) single crystalline Fe-25Pt (at%) micropillars were studied by compressive tests in the [001] direction. The pillar with the diameter of 400 nm exhibited recoverable strain of ~10.8% at room temperature. The recoverable strain is most likely caused by the stress-induced martensitic transformation from the face-centered-cubic (FCC) phase to the body-centered-tetragonal (BCT) phase although the thermally-induced transformation to the BCT phase does not occur down to 4.2 K. In this alloy superelasticity occurs in a wide temperature window of more than 200 K.