Preparation of Ni-Mn-Ga magnetic shape memory alloy by reduction-diffusion method

The invention relates to a method for preparing Ni-Mn-Ga magnetic shape memory alloy with magnetic-field-induced high strain and shape memory effect, which adopts metal calcium and alkali chloride or alkaline earth metal chloride as a reducer, and directly prepares the Ni-Mn-Ga magnetic shape memory alloy in a vacuum resistance furnace directly by metal nickel, metal manganese and gallium oxide through a reduction-diffusion method. Compared with the prior art, the method has the characteristics of no environmental pollution, simple process and low cost, directly prepares the Ni-Mn-Ga magneticshape memory alloy with the magnetic-field-induced high strain and the shape memory effect, and can be used for industrialized mass production.