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Phase Diagrams

· Under use conditions, the alloy should not undergo structural phase changes as these change its physical properties.
· Stabilizing the α-phase with aluminum yields a solid solution strengthened alloy of lower density than the pure Titanium and a higher usable maximum temperature.
· In the α + β two phase region, the alloy is strengthened by the presence of the second (β) phase. If this is distributed as small precipitates in the α-phase, interactions with dislocations will contribute to the yield stress and work hardening rate of the alloy.
· To increase the temperature range over which both α and β phases may coexist, additional alloying elements such as vanadium are added. The Ti- 6 wt% Al - 2 wt % Vanadium alloy can retain the two phase structure to room temperature.