Study on modification and mechanism of titanium alloy by die forming and sintering utilizing hydrogenated powder

The effect of hydrogenation on structure and properties of TC4 alloy sintered body was researched by means of the room-temperature die forming and sintering in protection air using hydrogenated powder. A new progress for preparation of Ti alloy parts the by the combination of hydrogenation titanium alloy powder forming and thermohydrogen treatment for titanium alloy was put forward. The results showed that with the increase of hydrogen content and increasing of sintering temperature, the density of TC4 sintered body had a rise trend gradually, the microstructure was changed from widmanstaten to two-state transitional structure, the lamellar and needle-like microstructure got thinner, and more fine isometric grains appeared. After annealing, the microstructure of TC4 sintered body with safe hydrogen content got more uniformity and refinement, the compressive yield strength showed an increasing trend. As a conclusion, the hydrogen content of 0.42 wt% was the best for the TC4 alloy sintered body according to the