Powder processing of titanium aluminide having superior oxidatio

Details Powder processing of titanium aluminide having superior oxidatio Powder processing of titanium aluminide having superior oxidatio

1992-01-03

1994-12-13

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

75249, 148670, 419 49, 420417, C22C 1400

Patent

active

053726634

ABSTRACT:
Ti powders and Al powders are combined to prepare a mixture of 40.about.55 at % of Al and the balance of Ti. After CIP and degassing, plastic working by hot extrusion is applied to form a shaped mixture of Ti and Al. The shaped mixture is then processed by HIP to synthesize titanium aluminide while diffusing Al into the Ti structure to form an Al.sub.2 O.sub.3 phase occurring from both the reaction between Al and oxygen contained in the Ti structure and the oxides on the Al surface, and to disperse the Al.sub.2 O.sub.3 to form the Al.sub.2 O.sub.3 protective film. With the reaction between Al and oxygen contained in the Ti structure and with the "Pegging" effect, both the Al.sub.2 O.sub.3 a phase formed at the grain boundaries of crystals or in the crystal grains of titanium aluminide and the Al.sub.2 O.sub.3 phase existing on the surface of raw material Al powder peg the surface Al.sub.2 O.sub.3 film to the surface of the titanium aluminide body. This "Pegging" effect enhances the adhesiveness of the film and improves the oxidation resistance of titanium aluminide.

REFERENCES:
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Eloff et al Prog. In Powder Metallurgy, vol. 37, 1982, p. 267.
Eylon et al Progress in Powder Met, vol. 42 (1986) pp. 625-634.
Eylon et al "Status of Ti-Powder Metallurgy" ASTM, 1984, pp. 48-65.

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