Abstract
W-10 wt.% Cr (W-10Cr) and W-20 wt.% Cr (W-20Cr) alloys were fabricated through mechanical alloying and spark plasma sintering technology. The microstructure of W-Cr alloys was characterized by XRD, SEM, TEM. The Cr added into W-20Cr alloy remarkably improves its relative density and the microhardness from 333.5 HV to 960.7 HV. The semicoherent precipitated phase Cr-O in W-20Cr alloy enhances the boundary strength, which consequently changes the fracture mode from typical intergranular fracture to a thorough transgranular fracture. Oxidation experiments at 800 °C and 1000 °C confirmed that W-20Cr alloy shows better oxidation resistance. During the oxidation process, W-rich phase exerts adverse effect on the antioxidant property of W-Cr alloys, Cr2WO6 and CrWO4 in oxide layer help improve the oxidation resistance. During the irradiation process, the doping of Cr element reduces the irradiation damage of W matrix and protects from forming the fuzz structure.
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