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Thermoelastic martensitic transformation from a face-centered-cubic austenite phase to tetragonal martensite phase has been established in a new ternary ferromagnetic alloy system Ni–Fe–Al (“prepared” in different states of site disorder) based on the results of a detailed neutron diffraction, electrical resistivity, and magnetization studies. Ordered (annealed) Ni55Fe20Al25 has a high Curie temperature TC⪢300K and an extremely wide temperature range over which martensite and austenite phases coexist. By comparison, site-disordered (quenched) Ni55Fe20Al25 has a lower TC (=225K), higher ductility (shape memory effect), higher saturation magnetization, and a very well-defined martensitic transformation around TC.
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Kaul et al. (2006) studied this question.
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