Claims
- 1. A method for preparing a high temperature melting molybdenum-chromium-silicon alloy having good low temperature damage resistance and high temperature strength and creep resistance to about 1500.degree. C., comprising the steps of:
- (a) preparing an alloy having a composition of molybdenum, chromium and silicon in the ranges of 25 to 40 atom percent Cr, 50 to 60 atom percent Mo and 13 to 16 atom percent Si; and
- (b) annealing said alloy between 1200.degree. C. and 1500.degree. C. to produce within said alloy a ductile refractory phase of a solid solution of Mo and Cr containing 2.4 to 2.8 atomic percent Si and an intermetallic matrix of (Mo,Cr).sub.3 Si, and wherein said refractory phase is substantially uniformly distributed within said intermetallic matrix.
- 2. The method of claim 1 further comprising, following the step of annealing said alloy, the step of hot working said alloy at about 1600.degree. C. to produce within said alloy the said intermetallic matrix within which said refractory phase is uniformly distributed in the form of elongated rods.
- 3. The method of claim 2 wherein said hot working is performed by one of extrusion, forging or powder metallurgy processing.
- 4. The method of claim 1 wherein the composition of said alloy contains a Mo to Cr atom ratio of about 2.0.
Parent Case Info
This application is a division of application Ser. No. 08/364,375, filed Dec. 27, 1994 now U.S. Pat. No. 5,505,793.
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 (2)
Foreign Referenced Citations (3)
Number |
Date |
Country |
6-220595 |
Aug 1994 |
JPX |
6-220596 |
Aug 1994 |
JPX |
6-212376 |
Aug 1994 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Svechnikov et al., Sb.Nauchn. Tr. Inst. Metallofiz; 20:94 Akad, Nauk SSR (1964) pp. 94-107. |
Massalski et al;Binary Alloy Phase Diagrams, 2d Ed, volz, pp.. 1333-1335, ASM International Materials Park, OH (1990). |
Anton et al. Development Potential of Advanced Intermetallic Materials, WRDC-TR-4122, Wright Patterson AFB, OH(1990), pp. i to 259. |
Divisions (1)
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Number |
Date |
Country |
Parent |
364375 |
Dec 1994 |
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