In order to obtain Ti-Mo alloy having high density and strength by sintering at temperature as low as possible, the effects of a slight amount of additive as Carbon (C), Nickel (Ni), Cobalt (Co) were investigated.
A Ti-12Mo alloy, in which β phase is stable, was selected as test material because of its high corrosion resistance and strength.
In this work, a slight amount of additives such as C, Ni, Co were added to the Ti-12Mo premixed powder before sintering. It was shown that Co was much effective on the strengthening: The tensile strength of Ti-12Mo sintered compacts containing 1.0 mass%Co was 1150 MPa, being more than 17% higher than the compacts without the additive. The density was also increased with increasing Co, though the maximum density was less than 95% of theoretical density. C also increased the densify of Ti-Mo compacts, however it lowered the strength because it made the pores irregular by precipitating the TiC particles in them. Ni improved neither the densifying nor the strengthening.
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