Abstract
Abstract The Y2O3/Ti-5Si alloy composites were prepared by nonconsumable vacuum arc melting through the synthesis reaction from Ti, Si, Y and SiO2. The thermodynamics of the insitu synthesis reaction were analyzed. Microstructural analysis showed that the Ti5Si3 and Y2O3 reinforcements were in-situ synthesized in the Ti matrix. Continuous and quasicontinuous network-shape Ti5Si3 + Ti eutectic cells are abundant, and Y2O3 grows from near-equiaxed shape to dendritic shape with increasing Y content in the composite. The introduction of in-situ Y2O3 particles results in a strong interfacial bonding between the reinforcement and matrix, which can significantly improve the wear resistance and frictional stability of Ti–Si alloy, due to the load-bearing function of the Y2O3 particles and the Ti5Si3 phase. Homogeneous distribution of the in-situ reinforcements helps to resist the propagation of subsurface microcracks and then improve the wear properties of in-situ composites.
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