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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 B4C (1500, 150 and 0.5 mm) were added to the titanium matrix during vacuum induction melting which can provide the in-situ reaction of 5Tiþ B4C 1⁄4 4TiBþ TiC. The tensile property of TMCs was investigated in accordance with the reinforcement distribution by B4C size. The size and morphology of in-situ reinforcements were quite different according to the B4C size. In-situ synthesized reinforcements by fine B4Cwere very minute and distributed homogeneously than coarse B4C. 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. [doi:10.2320/matertrans.M2011079]

Effect of B<SUB>4</SUB>C Size on Tensile Property of (TiB+TiC) Particulate Reinforced Titanium Matrix Composites by Investment Casting