Patent US4139400A successfully refreshed from Google Patents.
US4139400A
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Superplastic aluminium base alloys
Assignee: Rio Tinto Aluminium Bell Bay Ltd
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Filing: 1975-06-23
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Granted: 1979-02-13
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Expires: 1995-06-23
Abstract
Abstract Aluminium base alloys exhibiting superplastic deformation characteristics at elevated temperatures, having fully modified eutectic microstructures characterized by the absence of any primary phase and by the presence of at least one finely dispersed eutectic second phase.
Inventors
- 👤 Clive G. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:12
CPC Classifications
C; C22; C22C; C22C21/00; Y; Y10; Y10S; Y10S420/00; Y10S420/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 1000 - 2000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 250° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns; said composition being: ______________________________________
Element %
______________________________________
Mn 2 - 6
Si 0 - 1
Cu 0 - 2
Fe 0 - 3
Mg 0 - 4
Al Remainder, apart from impurities.
______________________________________
Claim 2
Dependent Claim
140 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 1000 - 2000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 250° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns; said composition being: ______________________________________
Element %
______________________________________
Mn 2 - 6
Si 0 - 1
Cu 0 - 2
Fe 0 - 3
Mg 0 - 4
Al Remainder, apart from impurities.
______________________________________
Claim 3
Dependent Claim
132 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 1000 - 2000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 250° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns; said composition being: ______________________________________
Element %
______________________________________
Fe 1 - 4
Mn 2 - 5
Si 0 - 1
Al Remainder, apart from impurities.
______________________________________
Claim 4
Dependent Claim
132 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 1000 - 2000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 250° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns; said composition being: ______________________________________
Element %
______________________________________
Fe 1 - 4
Mn 2 - 5
Si 0 - 1
Al Remainder, apart from impurities.
______________________________________
Claim 5
Dependent Claim
128 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 500 - 1000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 200° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns, said composition being: ______________________________________
Element %
______________________________________
Fe 1 - 3
Cu 1 - 4
Al Remainder, except for impurities.
______________________________________
Claim 6
Dependent Claim
128 words
A process for preparing an aluminum base alloy having an ultra fine fully modified eutectic microstructure which comprises forming a liquid melt of composition as hereinafter set forth, and allowing said melt to solidify under controlled conditions such that the rate of growth of the solid phase during solidification is 500 - 1000 microns/sec and the temperature gradient of the solid/liquid interface is from 100° - 200° C/cm, thereby to produce an alloy characterized by the absence of any primary phase and the presence of a high volume fraction of dispersed eutectic phase in the form of fibrous fully modified particles of size less than 10 microns, said composition being: ______________________________________
Element %
______________________________________
Fe 1 - 3
Cu 1 - 4
Al Remainder, except for impurities.
______________________________________
Claim 7
Dependent Claim
9 words
Aluminum-manganese alloys prepared by the process of claim 1.
Claim 8
Dependent Claim
9 words
Aluminum-iron-manganese alloys prepared by the process of claim 2.
Claim 9
Dependent Claim
9 words
Aluminum-iron-copper alloys prepared by the process of claim 3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |