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US3833363A
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Titanium-base alloy and method of improving creep properties
Assignee: RMI Co
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Filing: 1972-04-05
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Granted: 1974-09-03
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Expires: 1992-04-05
Abstract
Abstract A titanium-base alloy consisting by weight of about 5.5 to 6.5% aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, 0.7 to 3.0% molybdenum, 0.04 to 0.13% silicon, and the balance titanium. The addition of silicon to the otherwise known alloy produces a marked improvement in creep properties without significant detrimental effect to other properties.
Inventors
- 👤 H Bomberger
- 👤 S Seagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
C; C22; C22C; C22C14/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
An alloy as defined in claim 1 in which the silicon content is within the range of 0.08 to 0.09% by weight.
Claim 2
Dependent Claim
29 words
An alloy as defined in claim 1 of a weight composition approximately 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, 0.08 to 0.09% silicon, balance titanium and unavoidable impurities.
Claim 3
Independent Claim
128 words
A method of improving the creep properties of a titanium base alloy which otherwise consists by weight of about 5.5 to 6.5% aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, 0.7 to 3.0% molybdenum, balance titanium and unavoidable impurities, and which has a residual silicon content of about 0.02 to 0.03%, said method comprising adding silicon to said alloy in an amount to produce a silicon content therein of at least 0.04% but less than 0.10% including the residual, whereby the alloy attains sufficient creep strength that specimens thereof require a minimum time of 35 hours to reach 0.1% deformation when exposed to a stress of 35 Ksi at 950* F, yet retain sufficient notch toughness to have a minimum Charpy V-notch impact energy of 10 ft.-lbs.
Claim 4
Dependent Claim
28 words
A method as defined in claim 4 in which silicon is added to the alloy in an amount to produce a silicon content therein of 0.08 to 0.09%.
Claim 5
Dependent Claim
30 words
A method as defined in claim 4 in which the alloy otherwise consists by weight of approximately 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, balance titanium and unavoidable impurities.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |