1Non-Ferrous Metal Division, National Research Institute for Metals, Tokyo
The structures of Ti-4∼14%Al-2∼8%V alloys have been examined by optical microscopy after annealing for a long period in the range of 600°∼1100°C. A partial titanium-aluminium-vanadium ternary diagram for this range has been established.
To distinguish α and α2 phases, use was made of the fact that no precipitation from α2 occurs with decreasing temperature, but α2 is precipitated from α in the high aluminium alloys.
Ti-6%Al-4%V alloy is situated on the border-line for the formation of the α2 phase. Increase in aluminium or vanadium content for this alloy brings about the formation of the α2 phase.
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