CuCr30 alloy was processed by friction stir processing(FSP)for the first time.The comparative study of microstructure and arc ablation performance of CuCr30 alloy before and after FSP was carried out.The results show that the grain sizes of Cu and Cr phases in base metal are 3.56-34.16 μm and 4.77-32.36 μm,respectively.After FSP,the grain sizes of Cu and Cr phases are refined to 40-500 nm and 50-329 nm,respectively.Compared with the base metal,the mass loss of the FSP samples after 30 and 100 times of vacuum breakdown experiments is reduced by 77.8％and 39.2％,respectively.The ablation areas of the base metal and FSP samples after 100 times of vacu-um breakdown experiments are 6.91 and 8.01 mm2,respectively,which indicates that the refined Cr phase in the FSP samples disperses the arc energy,resulting in the ablation area being uniform and scattered,and thus improving the arc ablation performance of CuCr30 alloy.
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