CuCr25 alloys containing different Ni content were prepared by vacuum induction melting(VIM)l.The microstructure and proerties were tested.The results show that with the increase of Ni content in CuCr25 alloys,the Cr phase changed from developed dendrite into nodular grains and was drastically refined;the electrical con-ductivity significantly decrease,but still reach the level of convenlional CuCr50 when the Ni content is below 0.5The Ni content had little influence on their breakdown strength.The first breakdown sites transferred to the boundoary of Cu and Cr phase for CuCr25Ni compared to the Cr phase for CuCr25 without Ni.
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