Abstract: The influence of rolling deformation and heat treatment temperature on structures, mechanical properties is studied. The results of X-ray diffraction(XRD) show that preferred orientation is found in the direction of rolling in Ti₅₀Ni₄₇Fe₃ alloy. The grain size of Ti₅₀Ni₄₇Fe₃ alloy becomes smaller as deformation of rolling increases,but grows bigger while temperature of heat treatment rises. The fracture strength becomes higher while the deformation of Ti₅₀Ni₄₇Fe₃ alloy increases or the temperature of heat treatment lowers.

Key words: Ti₅₀Ni₄₇Fe₃ shape memory alloy, rolling deformation, preferred orientation, grain size, mechanical properties