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· 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.
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