Microstructure, mechanical and oxidation properties of in-situ synthesized (Y₂O₃ + TiC)/Ti-4.5Si composites

Abstract

Microstructure, mechanical and oxidation properties of in-situ synthesized (Y 2 O 3 + TiC)/ Ti-4.5Si composites (Y 2 O 3 + TiC)/Ti-4.5Si composites have been in-situ synthesized using arc-melting technology. Y 2 O 3 and TiC particles grow in near-equiaxed and dendritic shapes, which are distributed uniformly in Ti-4.5Si matrix including the network Ti + Ti 5 Si 3 eutectic cells. From hardness and compressive tests at room temperature, (Y 2 O 3 + TiC)/Ti-4.5Si composites show the higher hardness and compressive strength compared with the unreinforced and single TiC reinforced Ti-4.5Si matrix. The introduction of in-situ Y 2 O 3 and TiC particles influenced the oxidation behavior of the matrix. The excellent oxidation resistance of Y 2 O 3 and TiC particle reinforced composites is attributed to lower growth rate, dense oxide scale and stronger adherence of oxide scale.