The effect of alloy composition on the phase transformation and the microstructure of Ti-Ta alloys were investigated in detail in the present study. Alloys of eight different compositions in range of 1 to 40 at. pct Ta were quenched from β-region in ice water. The phase state and the resulting microstructures were investigated using light metallography, transmission electron microscopy, and X-ray diffraction.

It was established that with increase in tantalum content, the martensitic structure changes from hexagonal α′-phase to orthorhombic α′′-phase. The martensitic α′′-phase was found only in 10 and 30 at. pct Ta. The concentration dependence of the lattice parameters of the α′′-phase, the temperatures of the direct martensitic transformation are given. Omega-phase precipitation were not found in quenched alloys. The alloys of 35 - 40 at. pct Ta consist of metastable β-phase upon quenching only. It was established that stress-induced {110}_β and {332}_β twinning appeared in metastable β-phase.

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