Shape memory alloys are programmed to memorize original trained shape. Ni Mn Ga is
one of the ferromagnetic shape memory alloys. It is used as actuator, and sensor due to large output
strain at high frequencies. This work presents a study on enhancing magnetic properties of thermally
treated alloy by using new method of training. Single near stoichiometric composition was produced.
Elemental analysis showed homogeneity of the alloy. XRD pattern revealed Martensitic phase peaks.
Transformation temperature was found to be below 100 CO. Training was applied by hydrostatic
pressing die. Different training pressures were obtained using hydraulic press. After applying
hydrostatic pressures stating from 2.5 bar to 10 bar, it was found that pressures up to 7.5 bar will the
coercivity and saturation magnetization of the alloy, while loads beyond 7.5 bar lessened these
magnetic properties |
