A high-density fine-grain P/M titanium alloy of Ti-6Al-2Sn-4Zr-6Mo was prepared by mechanical alloying and vacuum sintering process. Effects of ball-milling time and sintering temperature on density and microstructure of the P/M titanium alloy have been investigated. The experimental observation shows that with increasing in ball-milling time

the density of Ti alloy is increased and its microstructure is converted from primary α phase and needle-like β phase into fine equiaxed α+β phase

in which the grain size is decreased gradually. The relative density of sintered materials with average grain size of only 2 μm reaches 99.1% with ball-milling time of 40 h and sintering at 1 200 ℃.