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The Y 2 O 3 /Ti-5Si alloy composites were prepared by nonconsumable vacuum arc melting through the synthesis reaction from Ti, Si, Y and SiO 2 . The thermodynamics of the insitu synthesis reaction were analyzed. Microstructural analysis showed that the Ti 5 Si 3  and Y 2 O 3  reinforcements were in-situ synthesized in the Ti matrix. Continuous and quasicontinuous network-shape Ti 5 Si 3  + Ti eutectic cells are abundant, and Y 2 O 3  grows from near-equiaxed shape to dendritic shape with increasing Y content in the composite. The introduction of in-situ Y 2 O 3  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 Y 2 O 3  particles and the Ti 5 Si 3  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.

international journal of materials research

Microstructure and tribological properties of in-situ Y 2 O 3 /Ti-5Si alloy composites: Paper presented at the 2 nd  Sino-German Symposium on Computational Thermodynamics and Kinetics and their Applications to Solidification