Copper based alloy was cryogenic treated at 800℃for 30 min and immersed liquid nitrogen for30 min

and effects of cryogenic treatment on thermal physical properties of copper based alloy were investigated.The results show that the cryogenic treatment can increase the thermal diffusivity coefficient

thermal conductivity and thermal expansion coefficients of the copper based alloy

and their reach0.339 3 cm2·s

-1

124.97 W·m

-1

·K

-1

and 0.545 4×10-5℃

-1

increased by 0.028 1 cm2·s

-1

10.54 W·m

-1

·K

-1

and 0.232 1×10-5℃

-1

respectively

compared with those of ones without cryogenic treatment at room temperature.