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Ti6Al4V alloy have been mainly used as implant materials. Ti-6Al-4V alloy instead of pure Ti is
being widely used as biomaterials has some characteristics such as high fatigue strength, ensile
strength. But it has been reported recently that vanadium component expresses cytotoxicity and
carcinogenicity and aluminium component is related with dementia of Alzheimer type.
In order to overcome their detrimental effects, -phase stabilizer Nb was chosen in the present
study, in addition Ta and Hf were added to Ti-40wt.%Nb alloy to improve its mechanical properties.
This paper was described the influence of heat treatment of Ti-40Nb alloys with 2wt%Ta,
2wt%Hf on the mechanical properties. Specimens of Ti alloys were melted in vacuum arc furnace
and homogenized at 1050 for 24 hr. and then were aged after solution heat treat at + and regions. The mechanical properties of Ti alloys were analysed by hardness test, tensile test, elongation test and SEM test.
The results can be summarized as follows:
1. The mechanical properties Ti-40wt.%Nb were improved when 2wt.% Ta and 2wt.%Hf were
added.
2. The higher tensile strength value and elongation at solution heat treat was higher than solution
heat treat and then were aged.