Patent US4297136A successfully refreshed from Google Patents.
US4297136A
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High strength aluminum alloy and process
Assignee: Huntington Alloys Corp
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Filing: 1978-10-16
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Granted: 1981-10-27
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Expires: 1998-10-16
Abstract
Abstract An improved process for hot working of dispersion-strengthened mechanically alloyed aluminum is provided based on a disclosed unconventional response of such material to thermomechanical processing. The process permits optimization of strength and workability and the production of aluminum alloys of very high strength.
Inventors
- 👤 Joseph R. Pickens
- 👤 Robert D. Schelleng
- 👤 Stephen J. Donachie
- 👤 Thomas J. Nichol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:57
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/053
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
202 words
In a process for treating a dispersion-strengthened mechanically alloyed aluminum consisting essentially, by weight, of a small but effective amount for increased strength up to about 7% magnesium, up to about 21/2% carbon, up to about 4% oxygen, and the balance essentially aluminum and said dispersoid content being a small but effective amount of dispersoid for improved strength up to about 81/2 volume %, comprising working said aluminum at an elevated temperature to form a hot worked product having a required strength, the improvement comprising: (a) selecting as the initial charge material a dispersion-strengthened mechanically alloyed aluminum material having in compacted form prior to working, a room temperature strength at least equal to the room temperature strength of the hot worked product, said charge material having the property in a temperature range up to incipient melting of increased workability with increasing working temperature; (b) determining the working temperature-strength profile of the selected charge material, said profile being charterized by an overall decrease in strength relative to the working temperature; and (c) working the charge material at a temperature selected with reference to the working temperature-strength profile to optimize the workability of the charge material and the strength of the hot worked product.
Claim 2
Dependent Claim
202 words
In a process for treating a dispersion-strengthened mechanically alloyed aluminum consisting essentially, by weight, of a small but effective amount for increased strength up to about 7% magnesium, up to about 21/2% carbon, up to about 4% oxygen, and the balance essentially aluminum and said dispersoid content being a small but effective amount of dispersoid for improved strength up to about 81/2 volume %, comprising working said aluminum at an elevated temperature to form a hot worked product having a required strength, the improvement comprising: (a) selecting as the initial charge material a dispersion-strengthened mechanically alloyed aluminum material having in compacted form prior to working, a room temperature strength at least equal to the room temperature strength of the hot worked product, said charge material having the property in a temperature range up to incipient melting of increased workability with increasing working temperature; (b) determining the working temperature-strength profile of the selected charge material, said profile being charterized by an overall decrease in strength relative to the working temperature; and (c) working the charge material at a temperature selected with reference to the working temperature-strength profile to optimize the workability of the charge material and the strength of the hot worked product.
Claim 3
Dependent Claim
34 words
A process according to claim 1, wherein the working temperature-strength profile includes a critical working temperature-strength transition zone which is characterized by a sharp lowering of room temperature strength relative to increased working temperature.
Claim 4
Dependent Claim
31 words
A process according to claim 2, wherein the said critical transition zone is preceded by a plateau region in which the strength of the product is substantially unaffected by increased temperature.
Claim 5
Dependent Claim
26 words
A process according to claim 3, wherein working of the charge material is carried out at a temperature selected in the plateau region for maximum strength.
Claim 6
Dependent Claim
44 words
A process according to claim 3, wherein working of the charge material is carried out at a temperature selected above the maximum temperature of the plateau region to achieve optimum workability of the charge material with sacrifice in strength of the hot worked product.
Claim 7
Dependent Claim
15 words
A process according to claim 1, wherein the working step comprises extruding the charge material.
Claim 8
Dependent Claim
19 words
A process according to claim 6, wherein for maximum strength the extrusion is carried out at a minimum ratio.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein the dispersion-strengthened mechanically alloyed aluminum contains at least about 80 wt. % aluminum.
Claim 10
Dependent Claim
20 words
A process according to claim 1, wherein the dispersion-strengthened mechanically alloyed aluminum contains at least about 90 wt. % aluminum.
Claim 11
Dependent Claim
37 words
A process according to claim 1, wherein the dispersion-strengthened mechanically alloyed aluminum consists essentially of a small but effective amount of dispersoid for improved strength up to about 81/2 volume % dispersoid, and the balance substantially aluminum.
Claim 12
Dependent Claim
193 words
A process for treating a dispersion-strenghthened mechanically alloyed aluminum consisting essentially, by weight, of a small but effective amount for increased strength up to about 7% magnesium, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum, the improvement comprising working said aluminum at an elevated temperature to form a worked product of required strength, wherein said aluminum is characterized by increased workability as temperature increases within a temperature range up to incipient melting of said aluminum, and wherein said aluminum is characterized by a working temperature-strength profile for extrusion equivalent to the pattern of FIG. 1 and an extrusion ratio strength pattern equivalent to FIG. 2 Curve A, which comprises: (a) selecting as the initial charge material a dispersion-strengthened mechanically alloy aluminum having in compacted form prior to working a room temperature tensile strength at least equal to the room temperature strength of the how worked product; and (b) extruding the charge material at a temperature selected with reference to the working-strength profile equivalent to the pattern shown in FIG. 1 to optimize the workability of the charge material and strength of the worked product.
Claim 13
Dependent Claim
193 words
A process for treating a dispersion-strenghthened mechanically alloyed aluminum consisting essentially, by weight, of a small but effective amount for increased strength up to about 7% magnesium, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum, the improvement comprising working said aluminum at an elevated temperature to form a worked product of required strength, wherein said aluminum is characterized by increased workability as temperature increases within a temperature range up to incipient melting of said aluminum, and wherein said aluminum is characterized by a working temperature-strength profile for extrusion equivalent to the pattern of FIG. 1 and an extrusion ratio strength pattern equivalent to FIG. 2 Curve A, which comprises: (a) selecting as the initial charge material a dispersion-strengthened mechanically alloy aluminum having in compacted form prior to working a room temperature tensile strength at least equal to the room temperature strength of the how worked product; and (b) extruding the charge material at a temperature selected with reference to the working-strength profile equivalent to the pattern shown in FIG. 1 to optimize the workability of the charge material and strength of the worked product.
Claim 14
Dependent Claim
55 words
A process according to claim 11, wherein the charge material consists essentially of about 2% up to about 5% Mg, up to about 21/2% C, up to about 4% O, and the extrusion is carried out at a temperature below the critical working temperature-strength transition zone to obtain optimum strength in the hot worked product.
Claim 15
Dependent Claim
20 words
A process according to claim 12, wherein the extrusion is carried out at a temperature up to about 750° F.
Claim 16
Dependent Claim
19 words
A process according to claim 13, wherein the extrusion is carried out at an extrusion ratio of about 1.
Claim 17
Dependent Claim
143 words
A process for treating a dispersion-strengthened mechanically alloyed aluminum containing, by weight, from about 2% up to about 7% Mg, up to about 21/2% C, and from up to about 4% O, by a method including steps comprising hot working said aluminum to form a consolidated product, the improvement of optimizing the strength of the consolidated product and workability during hot working by employing processing conditions in the interrelationship set forth by the following formula: UTS=-0.059T.sub.1 -0.014T.sub.2 -0.034T.sub.3 -0.055E.sub.R +11.6 (wt. % O)+20.1 (wt. % C)-0.18ε-3t+214.6 where UTS=Ultimate Tensile Strength in ksi (at room temperature) T 1 =Degas Temperature T 2 =Compaction Temperature T 3 =Extrusion Temperature E R =Extrusion Ratio, which is the ratio of the cross sectional area of the extruded billet to the cross sectional of the extruded rod. ε=Strain Rate (sec -1 ) t=Time at highest degassing temperature (hours)
Claim 18
Dependent Claim
143 words
A process for treating a dispersion-strengthened mechanically alloyed aluminum containing, by weight, from about 2% up to about 7% Mg, up to about 21/2% C, and from up to about 4% O, by a method including steps comprising hot working said aluminum to form a consolidated product, the improvement of optimizing the strength of the consolidated product and workability during hot working by employing processing conditions in the interrelationship set forth by the following formula: UTS=-0.059T.sub.1 -0.014T.sub.2 -0.034T.sub.3 -0.055E.sub.R +11.6 (wt. % O)+20.1 (wt. % C)-0.18ε-3t+214.6 where UTS=Ultimate Tensile Strength in ksi (at room temperature) T 1 =Degas Temperature T 2 =Compaction Temperature T 3 =Extrusion Temperature E R =Extrusion Ratio, which is the ratio of the cross sectional area of the extruded billet to the cross sectional of the extruded rod. ε=Strain Rate (sec -1 ) t=Time at highest degassing temperature (hours)
Claim 19
Dependent Claim
60 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance, having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 5% up to about 21/2% carbon, up to about 4% oxygen, and the balance essentially aluminum and characterized by tensile strength at room temperature of at least about 90 ksi.
Claim 20
Dependent Claim
60 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance, having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 5% up to about 21/2% carbon, up to about 4% oxygen, and the balance essentially aluminum and characterized by tensile strength at room temperature of at least about 90 ksi.
Claim 21
Dependent Claim
36 words
A dispersion-strengthened mechanically alloyed aluminum according to claim 16, wherein the magnesium content is about 2 to about 4%, the carbon level is at least about 0.2% and the oxygen level is at least about 0.3%.
Claim 22
Dependent Claim
12 words
A dispersion-strengthened mechanically alloyed aluminum prepared by the process of claim 1.
Claim 23
Dependent Claim
63 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 7%, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum and characterized by a tensile strength at room temperature of at least about 66.3 ksi.
Claim 24
Dependent Claim
63 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 7%, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum and characterized by a tensile strength at room temperature of at least about 66.3 ksi.
Claim 25
Dependent Claim
74 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 7%, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum and characterized by a tensile strength at room temperature of at least about 66.3 up to about 122.2 ksi and an elongation up to about 8%.
Claim 26
Dependent Claim
74 words
A dispersion-strengthened mechanically alloyed aluminum of high corrosion resistance having a composition consisting essentially, by weight, of magnesium in a small but effective amount for increased strength up to about 7%, up to about 21/2% carbon, about 0.3% up to about 4% oxygen, and the balance essentially aluminum and characterized by a tensile strength at room temperature of at least about 66.3 up to about 122.2 ksi and an elongation up to about 8%.
Claim 27
Dependent Claim
22 words
As an article of manufacture a dispersion-strengthened mechanically alloyed aluminum-magnesium alloy according to claim 16 in the form of a shaped article.
Claim 28
Dependent Claim
22 words
As an article of manufacture a dispersion-strengthened mechanically alloyed aluminum-magnesium alloy according to claim 20 in the form of a shaped article.
References Cited (Backward Citations)
US3607254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |