Alloy and method of treating titanium aluminide
First Claim
1. A method of enhancing massive transformation of a titanium aluminide alloy having a single alpha phase field by incorporating up to 0.5 at % of oxygen scouring means into the alloy which inhibits diffusion of oxygen within the alpha phase field to the grain boundary as the alloy is subjected to a temperature cycle which produces a massively transformed gamma microstructure.
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Abstract
A method of treating a titanium aluminide alloy having a single alpha phase field and being capable of producing a massively transformed gamma microstructure by subjecting the alloy to a temperature cycle that produces the massively transformed microstructure having a refined microstructure; the method being characterised in that oxygen securing means are provided within the alloy to prevent diffusion of oxygen to the grain boundary.
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Citations
16 Claims
- 1. A method of enhancing massive transformation of a titanium aluminide alloy having a single alpha phase field by incorporating up to 0.5 at % of oxygen scouring means into the alloy which inhibits diffusion of oxygen within the alpha phase field to the grain boundary as the alloy is subjected to a temperature cycle which produces a massively transformed gamma microstructure.
- 13. An alloy consisting of 43 to 50 at % aluminium, 0 to 9 at % niobium, 0 to 10 at % tantalum, 0.01 to 0.2 at % of yttrium and/or hafnium, the balance being titanium plus incidental impurities.
Specification