Appeal No. 1997-0538
Application No. 08/262,168
This is a decision on an appeal from the examiner’s final
rejection of claims 1 through 19 which are all of the claims
pending in the application.
Claims 1, 9 and 14 are representative of the subject
matter on appeal and read as follows:
1. A method of producing a gamma titanium aluminide alloy
article, comprising the steps of:
providing a piece of a gamma titanium aluminide alloy
having a composition capable of forming alpha, alpha-2, and
gamma phases;
determining the alpha transus temperature of the gama
titanium aluminide alloy piece;
consolidating the gamma titanium aluminide alloy piece at
elevated temperature to reduce porosity therein; and
heat treating the piece at a temperature of from about 5F
to about 300F below the alpha transus temperature for a time
sufficient to generate a refined microstructure comprising
from about 10 to about 90 volume percent gamma phase.
9. A method of producing a gamma titanium aluminide alloy
article, comprising the steps of:
providing a piece of a gamma titanium aluminide alloy
having a composition capable of forming alpha, alpha-2, and
gamma phases;
determining the alpha transus temperature of the gamma
titanium aluminide alloy piece;
hot isostatic pressing the gamma titanium aluminide alloy
piece at a temperature of from about 50F to about 250F below
the alpha transus temperature and at a pressure of from about
2
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