US4002502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum base alloys
Assignee: University of Queensland
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Filing: 1974-08-06
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Granted: 1977-01-11
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Expires: 1994-08-06
Abstract
Abstract Aluminum base alloys, having improved properties as regards mechanical working treatments, according to the invention are characterized by a content of 0.5 - 10.0 wt. % iron, without or with a very small content (up to 0.1 wt. %) of Li or Na or Sr or Ba. The alloy has a microstructure comprising a substantial portion of refined Al3Fe and/or very fine Al6Fe.
Inventors
- 👤 Ian Frank Bainbridge
- 👤 Colin McLean Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:00
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
In a method of casting aluminum-iron alloy from a melt with a controlled temperature gradient between the solid and liquid metal and with a controlled rate of growth of the alloy phases as they solidify, said alloy consisting essentially of aluminum and 0.5 to 10% by weight of iron and having a cast microstructure containing aluminum and eutectic compounds including Al 3 Fe and Al 6 Fe and mixtures thereof, the improvement which comprises providing in said melt at least one constituent from the group consisting of lithium, sodium, strontium or barium in an amount which is effective to improve the strength or ductility of said alloy by producing in said alloy a refined form of Al 3 Fe or very fine Al 6 Fe, the amount of each constituent being up to 0.1% by weight of said melt and the total amount of such constituents not exceeding 0.4% by weight of said melt.
Claim 2
Dependent Claim
154 words
In a method of casting aluminum-iron alloy from a melt with a controlled temperature gradient between the solid and liquid metal and with a controlled rate of growth of the alloy phases as they solidify, said alloy consisting essentially of aluminum and 0.5 to 10% by weight of iron and having a cast microstructure containing aluminum and eutectic compounds including Al 3 Fe and Al 6 Fe and mixtures thereof, the improvement which comprises providing in said melt at least one constituent from the group consisting of lithium, sodium, strontium or barium in an amount which is effective to improve the strength or ductility of said alloy by producing in said alloy a refined form of Al 3 Fe or very fine Al 6 Fe, the amount of each constituent being up to 0.1% by weight of said melt and the total amount of such constituents not exceeding 0.4% by weight of said melt.
Claim 3
Dependent Claim
29 words
Method according to claim 1 wherein the temperature gradient and growth rate during casting are controlled at values to the right of boundary line A-B of FIG. 4 hereof.
Claim 4
Dependent Claim
37 words
Method according to claim 1 wherein the resultant alloy is subjected to prolonged thermal treatment just below the eutectic temperature for more than 8 hours, followed by air cooling or water quenching, whereby improved ductility is obtained.
Claim 5
Dependent Claim
10 words
The cast product produced by the method of claim 1.
Claim 6
Dependent Claim
10 words
The cast product produced by the method of claim 2.
Claim 7
Dependent Claim
10 words
The cast product produced by the method of claim 3.
References Cited (Backward Citations)
US3827917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |