Abstract
CuCr25 alloy samples in this study were coated with Cr and irradiated by high current pulsed electron beam (HCPEB) with intermittently increasing pulse numbers from 1 to 100. The results indicated that with HCPEB treatment, initial Cr particles and coated Cr layer remelted and distributed nonuniformly in Cu. Meanwhile, The Cr particles were significantly refined and the solid solubility of Cr in Cu increased with raising pulse number. The formation of craters was a remarkable feature under pulse number 30 due to the dynamic thermal field created by HCPEB. Another notable characteristic induced by HCPEB were numerous cracks formed as a result of thermal stresses during irradiation when the pulse number was up to 10, then the cracks dissolved when the pulse number increased to more than 50. In addition, a preference of these cracks to Cr particles instead of Cu phase has been also noted. Keywords-CuCr25 alloy; microstructure; high current pulse electron beam; surface modification.
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