Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.v.

Deutsche Forschungsanstalt Fur Luft-und Raumfahrt E.v.

Karl-Josef Grundhoff

Hartmut Schurmann

Manfred Peters

Yong-Tai Lee

Gunter Wirth

A process as described for treating Ti.sub.3 Al-based alloys comprising, in ddition 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

Thermomechanical process for treating titanium aluminides based on Ti.sub.3

The process relates to the improvement of the static and dynamic mechanical roperties of (.alpha.+.beta.) titanium alloys by thermomechanical treatment, wherein the alloys produced by melting and forging and/or hot isostatic pressing of powders are deformed by more than 60% with simultaneous strain-hardening at a temperature just above the recrystallization temperature of the relevant alloys in one or more steps, with structure stress-relief heatings being performed without complete recrystallization between these individual steps, the shaped part is then tempered for 2 to 4 min near the transus of the alloy, quenched and then aged at temperatures in the range of from 400.degree. to 600.degree. C.

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Troisdorf, Germany

Karl-Josef Grundhoff