To　further　improve　the　mechanical　properties　of　titanium　matrix　composite　containing　relatively　high　fraction　of　TiC　and　Ti5Si3　particles,　(6.5　vol%　TiC　+　3.3　vol%　Ti5Si3)/Ti6Al4V　composites　were　prepared　at　different　sintering　temperatures,　and　then　were　carried　out　heat　treatments.　The　microstructure　evolution　and　corresponding　mechanical　behavior　of　composites　were　investigated.　It　found　that　the　aggregation　of　particles　in　composite　was　reduced　with　the　sintering　temperature　increasing,　while　the　size　of　particles　was　increased.　During　the　quenching　process,　the　Ti5Si3　particles　dissolved　into　matrix　and　TiC　particle　played　the　role　of　preventing　the　growth　of　matrix.　TEM　and　EBSD　analyses　revealed　that　the　size　of　Ti5Si3　particles　increased　(from　50　nm　to　300　nm)　with　the　aging　temperature　increasing　(from　700　°C　to　900　°C),　and　growth　mechanism　of　matrix　transformed　from　boundary　migration　to　grain　coalescence,　leading　to　the　abnormal　growth　of　matrix.　1200　°C　sintered　composite　had　the　compressive　yield　strength　of　1780　MPa　and　compressive　strain　of　21%.　After　1200　°C　solution　treating　followed　by　800　°C　aging　treating,　the　yield　strength　increased　to　1900　MPa　without　obvious　decline　of　ductility.　The　improvement　was　attributed　to　the　strengthening　effect　of　particles.　©　2020　Elsevier　B.V.