Claims
- 1. A method to produce duplex microstructure in an article of tungsten-containing gamma titanium aluminide alloy, which comprises the steps of: (a) hot working the article, (b) annealing said article at an annealing temperature in the range of T.sub.e +100.degree. C. to T.sub..alpha. -30.degree. C. for about 1 to 15 hours, (c) cooling said article from said annealing temperature to an aging temperature in the range of 700.degree. to 1050.degree. C. at a cooling rate of about 5 to 1000.degree. C./min, and (d) aging said article at said aging temperature for about 2 to 150 hours.
- 2. The method of claim 1 wherein said alloy has the composition Ti-(45.5-47.5) Al-(0-3.0)X-(1-5)Y-(0.05-1.0)W, where X is Cr, Mn or any combination thereof, and Y is Nb, Ta or any combination thereof.
- 3. The method of claim 2 wherein said alloy has the composition Ti-(46-47) Al-(1.5-3.0)Cr-(2-3.5)Nb-(0.1-0.3)W.
Parent Case Info
This is a division of application Ser. No.: 08/379,860, filed Jan. 27, 1995, now U.S. Pat. No. 5,558,729.
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5185045 |
Peters et al. |
Feb 1993 |
|
5226985 |
Kim et al. |
Jul 1993 |
|
5417781 |
McQuay et al. |
Mar 1995 |
|
Non-Patent Literature Citations (1)
Entry |
Kim et al., "Deformation and Fracture Behavior of Gamma Titanium Aluminides", pp. 373-382 in Aspects of High Temperature Deformation and Fracture in Crystalline Materials, edited by Y. Hosi et al., The Japan Institute of Metals, Sendai, Japan 1993. |
Divisions (1)
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Number |
Date |
Country |
Parent |
379860 |
Jan 1995 |
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