Abstract
This article covers the detailed study on the preparation and characterization of off-stoichiometric ferromagnetic Ni–Mn–Ga shape memory alloy. It has been found that annealing the polycrystalline Ni–Mn–Ga alloy at 700°C for 20 hours under argon atmosphere reduces the range of transformation temperature. The differential scanning calorimetric measurement reveals that the alloy has the martensitic transformation temperature at room temperature and it is less than the critical temperature. Magnetic measurement has been performed using vibrating sample magnetometer. The observed narrow transformation hysteresis around 5°C during cooling and heating process suggests that annealing modifies the microstructure, transformation temperature, and the magnetic properties of the polycrystalline Ni–Mn–Ga alloy.
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