US4067733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength aluminum alloy
Assignee: Individual
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Filing: 1976-09-01
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Granted: 1978-01-10
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Expires: 1996-09-01
Abstract
Abstract An aluminum casting alloy having superior foundry characteristics, being heat-treatable to ultra-high yield strength, and containing from about 3 to about 10% silicon about 0.7 to about 1.5% magnesium, from about 0.03 to about 1% beryllium, and from 0.05 to 1% titanium and a method for preparing such alloys is disclosed.
Inventors
- 👤 Myron G. Urdea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:42
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
An aluminum casting alloy having superior foundry characteristics and being heat treatable to ultra-high yield strength consisting essentially of from about 5.5 to about 7.5% silicon, about 0.85 to about 1.25% magnesium, about 0.10 to about 0.30% beryllium, about 0.05 to about 0.30% titanium and containing less than 0.20% iron, 0.10% manganese, copper and zinc, 0.01% boron and 0.002% lithium, sodium and calcium, balance aluminum.
Claim 2
Dependent Claim
65 words
An aluminum casting alloy having superior foundry characteristics and being heat treatable to ultra-high yield strength consisting essentially of from about 5.5 to about 7.5% silicon, about 0.85 to about 1.25% magnesium, about 0.10 to about 0.30% beryllium, about 0.05 to about 0.30% titanium and containing less than 0.20% iron, 0.10% manganese, copper and zinc, 0.01% boron and 0.002% lithium, sodium and calcium, balance aluminum.
Claim 3
Dependent Claim
90 words
The method of obtaining ultra-high yield strength aluminum alloy consisting essentially of casting molten alloy having the composition defined in claim 1 and then heat treating said cast alloy by solutionizing said alloy at about 1020° F for about 16 to about 24 hours, then quenching said alloy within 10 seconds in cool water to about 120° F or less, aging the cooled alloy at room temperature from about 18 to about 48 hours, and thereafter aging the alloy at about 350° F for about 8 to about 10 hours.
Claim 4
Dependent Claim
31 words
The method defined in claim 2 further including the step of bubbling nitrogen through said molten alloy continuously during casting to minimize the introduction and effect of hydrogen on the alloy.
References Cited (Backward Citations)
US2908566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |