Microstructure of as-cast

forged and solid solution treated CuCr25 contact materials prepared by atmospheric casting in main frequency induction furnace have been observed by scanning electron microscope （SEM）

and effects of aging treatment and deformation rate on electric conductivity and micro-hardness of the contact materials have been examined. The results show that the Cr phase can be distributed uniformly into the forged CuCr25 alloy. The alloy exhibits higher electric conductivity and micro-hardness with aging at 440 ℃ for one hour after solid solution at 950 ’C for one hour

while the electric conductivity and micro-hardness of 40% cold deformed alloy can reach 33. 1 MS/m and 174

respectively

after solid solution treatment with aging at 440 *C for two hours

increased by 5. 8 MS/m and 27

respectively

compared with those of the alloy after solid solution treatment with direct aging.