Tribological Properties of Ti–4Si–xZr–yY2O3/5TiO2 Composites Prepared by High-Energy Milling, Cold Pressing and Sintering
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In the present study, tribological properties of Ti–4Si–xZr–yY2O3/5TiO2 were investigated. Four composites; Ti–4Si/5TiO2, Ti–4Si–1.3Zr/5TiO2, Ti–4Si–0.3Y2O3/5TiO2 and Ti–4Si–1.3Zr–0.3Y2O3/5TiO2 were fabricated by high-energy milling and cold pressing method. The composites showed enhanced wear and friction resistance against Si3N4 spheres counterface. The hardness and wear resistance of the composite increased with the addition of rare earth and Zirconium. Ti–4Si–1.3Zr–0.3Y2O3/5TiO2 composite has the smallest wear scar (222 μm) showing good wear resistance. Fatigue wear, supplemented by abrasive, oxidative and adhesive wears were identified as the predominant wear mechanisms. The study also found that rare earth Y2O3 can significantly improve the wear resistance of composites as it reduces the friction coefficient of Ti–4Si–1.3Zr/5TiO2 composite by about 25%.
KeywordsTi–Si alloy matric composites Microstructure Tribological properties
The authors would like to acknowledge the financial support of Jiangsu Provincial Industrial Science and Technology Support Program (Grant No. BE2008118) and the Basic Research on Isotropic Ultra-high Strength Aluminum Matrix Composite (Grant No. 6140922010201).
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