抄録
Ti–6Al–4V alloy specimens were prepared by sintering Ti/TiH2 powders with pre-alloyed TiAl and Al–V powders. Changes in the sintered density, Vickers hardness, and phase structure of the Ti–6Al–4V (Ti6Al4V) and hydrogenated Ti–6Al–4V (H-Ti6Al4V) alloys as a function of the vacuum sintering temperature (700–1,300°C) were investigated. The sintered density and Vickers hardness of the Ti6Al4V and the H-Ti6Al4V alloys increased as the sintering temperature increased, while the concentration of oxygen considerably decreased with increasing sintering temperature. The oxygen concentration of the H-Ti6Al4V alloy was lower than that of the Ti6Al4V alloy. The sintered density and Vickers hardness values of the Ti6Al4V and H-Ti6Al4V alloys were almost the same. These results suggest that the preparation of Ti6Al4V alloy using TiH2 powder is more cost-effective and produces sintered products with lower oxygen concentrations.
