Microstructure and Mechanical Properties of Ti-Al Based Composites.

Ceramic particulate dispersed Ti-Al intermetalic compound composites were successfuly fabricated by hot-pressing the mixtures of Ti and Al (Ti/Al=70/30at%) powders with fine ceramic particulates, SiC and B4C, as the second phases. There were a little reactions between the Ti-Al intermetalic compound and ceramic particulate during the hot-pressing. The microstructure observations showed that both reaction phases and second phases were homogeneously dispersed in the Ti-Al matrix. Their mechanical properties on the hardness and strength were improved by these ceramic dispersions. The relationship between mechanical properties and microstructure was discussed for these ceramic particulate reinforced Ti-Al based composites.