Influence of RE on Microstructure and Properties of CuCr25 Contact Material
The atmospheric cast CuCr25 and CuCr25RE alloy contact material which were prepared by medium frequency induction furnace was studied.The microstructure of CuCr25 and CuCr25RE alloy after casting and forging were observed and compared by SEM.And the effect of rare earth(RE) on the electrical conductivity and softening temperature of CuCr25 alloy was discussed.The results show that the microstructure distributes homogeneously after forging,but with the addition of RE,Cr particles were refined obviously.And after solution at 950℃ for 1h and aging at different temperature,the addition of RE improves the electrical conductivity of the alloy.Aged at 480℃ after 40% cold deformation,the value of electrical conductivity improves significantly compared with that without deformation.The RE additive improves the softening resistance,which can increase the softening temperature of CuCr25 alloy about 25℃.