Thermomechanical process for treating titanium aluminides based on Ti.sub.3
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United States of America Patent
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Feb 9, 1993
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N/A
app pub date -
Jul 25, 1991
filing date -
Jul 27, 1990
priority date (Note) -
Expired
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Abstract
A process as described for treating Ti.sub.3 Al-based alloys comprising, inddition to titanium and aluminum as .alpha.-phase-stabilizing element, niobium and further elements stabilizing the .beta.-phase in an amount of from 20 to 30% by weight, wherein the further elements stabilizing the .beta. phase are present in an amount of at least 4% by weight by (a) preparing the alloys by melting or via the powder-metallurgical route, (b) deforming at a temperature within the (.alpha..sub.2 +.beta.)-phase area by more than 60% in one or more steps with stress-relief annealing without complete recrystallization effected between these steps, (c) solution annealing the formed part for from 5 minutes to 120 minutes below the .beta.-transus temperature of the alloy, (d) quenching, and (e) subsequent aging/stress-relief annealing at temperatures within the range of from 500.degree. for 75.degree. C. for from 0.5 to 24 hours.
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