The aim of this research is to evaluate the microstructure and tensile property of in-situ particulate (TiB+TiC) reinforced titanium matrix composites (TMCs) synthesized by investment casting process. Different size of B 4 C (1500, 150 and 0.5 mm) were added to the titanium matrix during vacuum induction melting which can provide the in-situ reaction of 5Ti þ B 4 C ¼ 4TiB þ TiC. The tensile property of TMCs was investigated in accordance with the reinforcement distribution by B 4 C size. The size and morphology of in-situ reinforcements were quite different according to the B 4 C size. In-situ synthesized reinforcements by fine B 4 C were very minute and distributed homogeneously than coarse B 4 C. Moreover, the improvement of the tensile strength and ductility of TMCs was caused by not only load transfer strengthening but also the matrix grain refinement and homogeneous distribution of the reinforcements.
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