Development of Y2O3 Dispersion-Strengthened Copper Alloy by Sol-Gel Method |
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Authors: | Jiangang Ke Zhuoming Xie Rui Liu Ke Jing Xiang Cheng Hui Wang Xianping Wang Xuebang Wu Qianfeng Fang Changsong Liu |
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Institution: | 1.Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; (J.K.); (Z.X.); (K.J.); (X.C.); (H.W.); (X.W.); (X.W.); (C.L.);2.Scinece Island Branch, Graduate School, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | In this study, oxide dispersion-strengthened Cu alloy with a Y2O3 content of 1 wt.% was fabricated through citric acid sol-gel synthesis and spark plasma sintering (SPS). The citric acid sol-gel method provides molecular mixing for the preparation of precursor powders, which produces nanoscale and uniformly distributed Y2O3 particles in an ultrafine-grained Cu matrix. The effects of nanoscale Y2O3 particles on the microstructure, mechanical properties and thermal conductivity of the Cu-1wt.%Y2O3 alloy were investigated. The average grain size of the Cu-1wt.%Y2O3 alloy is 0.42 μm, while the average particle size of Y2O3 is 16.4 nm. The unique microstructure provides excellent mechanical properties with a tensile strength of 572 MPa and a total elongation of 6.4%. After annealing at 800 °C for 1 h, the strength of the alloy does not decrease obviously, showing excellent thermal stability. The thermal conductivity of Cu-1wt.%Y2O3 alloy is about 308 Wm−1K−1 at room temperature and it decreases with increasing temperature. The refined grain size, high strength and excellent thermal stability of Cu-1wt.%Y2O3 alloys can be ascribed to the pinning effects of nanoscale Y2O3 particles dispersed in the Cu matrix. The Cu-Y2O3 alloys with high strength and high thermal conductivity have potential applications in high thermal load components of fusion reactors. |
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Keywords: | copper sol-gel mechanical properties thermal stability thermal conductivity |
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