Abstract
The effect of the fourth element Al on the martensitic transformation and magnetic properties of polycrystalline Ni–Fe–Ga alloys is investigated. A complete thermoelastic martensitic transformation in Ni–Fe–Ga–Al alloys was observed in a range of 309–394 K. Martensitic transformation temperatures of Ni–Fe–Ga alloys are obviously decreased by the substitution of Al for Ga element: the addition of 1% Al can decrease the martensitic transformation temperature by about 68 K. On the other hand, the substitution of Al for Ga increases the saturation magnetization and decreases the saturation magnetic field.
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