Abstract
Fe3Pt with a degree of order of S = 0.75 shows a second-order-like martensitic transformation from a cubic structure to a tetragonal one at approximately 90K. We found by neutron diffraction that this alloy exhibits a large elastic strain of more than 6% by the application of compressive stress in the [001] direction. A large elastic anisotropy caused by lattice softening in elastic constant C’, which occurs on approaching the transformation temperature, was found to be responsible for the large elastic strain of Fe3Pt.
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