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

Deutsche Forschungsanstalt Fur Luft-und Raumfahrt E.v.

Hartmut Schurmann

Karl-Josef Grundhoff

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.

Growing community of inventors

Neunkirchen Seelscheid, Germany

Hartmut Schurmann