Hefei University of Technology - School of Materials Science and Engineering; Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province
Hefei University of Technology - School of Materials Science and Engineering; Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province
Hefei University of Technology - School of Materials Science and Engineering; Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province
Hefei University of Technology - School of Materials Science and Engineering; Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province
Hefei University of Technology - School of Materials Science and Engineering; Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province; National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology
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.
Keywords: W-Cr alloy, Semi-coherent second phase, oxidation behavior, He ions irradiation
Luo, Lai–Ma and Huang, Ke and Hou, Qing–Qing and Tan, Xiao–Yue and Zan, Xiang and Xu, Qiu and Zhu, Xiao–Yong and Wu, Yu–Cheng, Microstructure and Its High Temperature Oxidation Behavior of W-Cr Alloys Prepared by Spark Plasma Sintering (January 16, 2019). Available at SSRN: https://ssrn.com/abstract=3317057 or http://dx.doi.org/10.2139/ssrn.3317057
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