Ni-Mn-Ga shape memory alloys development in China

Study on Ni-Mn-Ga ferromagnetic shape memory alloys recently keeps active. Intermartensitic transformation was found. Magnetic field enhanced phase transformation strain was discovered, and achieved up to 4%. Fifteen percent super high strain induced by variant reorientation under stress was obtained in non-modulated martensite. Six percent large magnetic field induced strain was achieved, and the temperature dependence was investigated in 5-layered martensite single-variant Ni-Mn-Ga alloys. Several other systems of magnetic shape memory alloys and high temperature shape memory alloy Ni-Mn-Ga are also reviewed.