NIMNGA ALLOY WITH A CONTROLLED FINISH POINT OF THE REVERSE TRANSFORMATION AND SHAPE MEMORY EFFECT

摘要

In the NiMnfa alloy represented by the chemical composition Ni _{2 + X} Mn _lx Ga, the composition ratio variable (X) is selected in the range of 0,10 ≦ X ≦ 0.30. In the above composition ratio, the end point of the reverse transformation of the martensite transformation is selected at a predetermined temperature within a temperature range of -20 to 50 ° C, while the Curie point is selected at a predetermined temperature within a temperature range of 60 to 85 ° C. . The alloy has a shape memory effect by martensitic transformation and its reverse transformation. In addition, the alloy induces inverse transformation by applying an external magnetic field on the martensite, resulting in a shape memory effect.