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Buttons of high-temperature shape-memory alloy Ni 56 Mn 25 –  x  Fe  x  Ga 19  were prepared by arc melting under argon atmosphere. The specimens were hot rolled to 1 mm plates, and their martensitic transformation behaviors, ductilities, and shape-memory effects were investigated through differential scanning calorimetry and bending tests. It was found that the brittleness of polycrystalline Ni 2 MnGa was ameliorated through introduction of a ductile phase by Fe addition. Ni 56 Mn 17 Fe 8 Ga 19  alloy shows great potential as a practical high-temperature shape-memory alloy with martensitc transformation start temperature above 200 °C. It can bear strain of 6% before fracture in bending tests and shows a maximum reversible strain of 3.5%.

Martensitic transformation, ductility, and shape-memory effect of polycrystalline Ni 56 Mn 25 – x Fe x Ga 19 alloys