Abstract：With the help of scanning electron microscope and differential thermal analyzer, the microstructure
and reaction temperature of Ni-Ti mixed system under different heating rates were studied, and the effect of heat‐
ing rate on the chemical reaction process of Ni and Ti was investigated. The reaction kinetic parameters of Ni-Ti
mixed system were calculated by Kissinger equation, in order to further regulate the chemical reaction between
Ni and Ti in the process of powder metallurgy and prepare high-quality porous NiTi shape memory alloy. The re‐
sults show that with the increase of heating rate, the chemical reaction of Ni-Ti mixed system is significantly en‐
hanced, and the reaction heat release is significantly increased, but the initial reaction temperature changes little.
The reaction activation energy of Ni-Ti mixed system is 130 kJ/mol, and the reaction rate constant is 5.6×10-3,
the reaction order is 1.26.
2022, Vol. 32 
