US4412870A
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Wrought aluminum base alloy products having refined intermetallic phases and method
Assignee: Alcoa Corp
•
Filing: 1980-12-23
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Granted: 1983-11-01
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Expires: 2000-12-23
Abstract
Abstract A wrought aluminum alloy product is disclosed. The alloy consists essentially of 0.5 to 10 wt. % Mg, 0.1 to 1.6 wt. % Mn, 0 to 0.35 wt. % Cr, at least 0.005 wt. % Sr, less than 1 wt. % Fe, 1 wt. % max. Si, 3.5 wt. % max. Zn, 1 wt. % max. Cu, the remainder aluminum and incidental impurities. The product is characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Inventors
- 👤 William D. Vernam
- 👤 Ralph W. Rogers, Jr.
- 👤 Harry C. Stumpf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:21
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 88
Claim 1
Independent Claim
87 words
A wrought aluminum alloy product, the alloy consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, 0.3 wt.% max. Ti, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 2
Dependent Claim
87 words
A wrought aluminum alloy product, the alloy consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, 0.3 wt.% max. Ti, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 3
Dependent Claim
19 words
The product in accordance with claim 1 wherein Mg is maintained in the range of 0.5 to 5.6 wt.%.
Claim 4
Dependent Claim
19 words
The product in accordance with claim 1 wherein Mg is maintained in the range of 3.5 to 4.5 wt.%.
Claim 5
Dependent Claim
19 words
The product in accordance with claim 1 wherein Mn is maintained in the range of 0.2 to 0.8 wt.%.
Claim 6
Dependent Claim
14 words
The product in accordance with claim 1 wherein Mn is less than 1 wt.%.
Claim 7
Dependent Claim
14 words
The product in accordance with claim 1 wherein Cr is less than 0.25 wt.%.
Claim 8
Dependent Claim
14 words
The product in accordance with claim 1 wherein Fe is less than 0.8 wt.%.
Claim 9
Dependent Claim
14 words
The product in accordance with claim 1 wherein Fe is less than 0.5 wt.%.
Claim 10
Dependent Claim
14 words
The product in accordance with claim 1 wherein Ti is less than 0.3 wt.%.
Claim 11
Dependent Claim
14 words
The product in accordance with claim 1 wherein Si is less than 0.5 wt.%.
Claim 12
Dependent Claim
14 words
The product in accordance with claim 1 wherein Si is less than 0.35 wt.%.
Claim 13
Dependent Claim
19 words
The product in accordance with claim 1 wherein Sr is maintained in the range of 0.005 to 0.5 wt.%.
Claim 14
Dependent Claim
19 words
The product in accordance with claim 1 wherein Sr is maintained in the range of 0.01 to 0.25 wt.%.
Claim 15
Dependent Claim
87 words
A wrought aluminum alloy product, the alloy consisting essentially of 0.5 to 5.6 wt.% Mg, about 0.2 to 1.8 wt.% Mn, 0.25 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.3 wt.% max. Ti, 0.5 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 16
Dependent Claim
87 words
A wrought aluminum alloy product, the alloy consisting essentially of 0.5 to 5.6 wt.% Mg, about 0.2 to 1.8 wt.% Mn, 0.25 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.3 wt.% max. Ti, 0.5 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 17
Dependent Claim
85 words
An aluminum alloy flat rolled product, the product consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 18
Dependent Claim
85 words
An aluminum alloy flat rolled product, the product consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 19
Dependent Claim
59 words
The product in accordance with claim 15 consisting essentially of 2.2 to 5.6 wt.% Mg, 0.1 to 1 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.25 wt.% max. Si, 0.4 wt.% max. Fe, 0.1 wt.% max. of both Cu and Zn, the balance aluminum and impurities, the total of impurities not exceeding 0.15 wt.%.
Claim 20
Dependent Claim
12 words
The product in accordance with claim 15 wherein said product is sheet.
Claim 21
Dependent Claim
92 words
A wrought aluminum alloy sheet product suitable for machining and using as substrates, including memory disc substrates, the product consisting of 0.5 to 10 wt.% Mg, about 0.2 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 22
Dependent Claim
92 words
A wrought aluminum alloy sheet product suitable for machining and using as substrates, including memory disc substrates, the product consisting of 0.5 to 10 wt.% Mg, about 0.2 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, the product characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 23
Dependent Claim
18 words
The product in accordance with claim 18 wherein Mg is in the range of 0.5 to 5.6 wt.%.
Claim 24
Dependent Claim
18 words
The product in accordance with claim 18 wherein Mg is in the range of 3.5 to 4.5 wt.%.
Claim 25
Dependent Claim
18 words
The product in accordance with claim 18 wherein Mn is in the range of 0.2 to 0.8 wt.%.
Claim 26
Dependent Claim
14 words
The product in accordance with claim 18 wherein Mn is less than 1 wt.%.
Claim 27
Dependent Claim
18 words
The product in accordance with claim 18 wherein Cr is in the range of 0.05 to 0.25 wt.%.
Claim 28
Dependent Claim
14 words
The product in accordance with claim 18 wherein Fe is less than 0.5 wt.%.
Claim 29
Dependent Claim
14 words
The product in accordance with claim 18 wherein Zn is less than 0.25 wt.%.
Claim 30
Dependent Claim
14 words
The product in accordance with claim 18 wherein Ti is less than 0.15 wt.%.
Claim 31
Dependent Claim
18 words
The product in accordance with claim 18 wherein Sr is in the range of 0.005 to 0.5 wt.%.
Claim 32
Dependent Claim
14 words
The product in accordance with claim 18 wherein Si is less than 0.35 wt.%.
Claim 33
Dependent Claim
91 words
A wrought aluminum alloy sheet product suitable for machining and using as a memory disc substrate, the product consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, the product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 34
Dependent Claim
91 words
A wrought aluminum alloy sheet product suitable for machining and using as a memory disc substrate, the product consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, the product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 35
Dependent Claim
78 words
A memory disc substrate consisting essentially of about 3.5 to 4.5 wt.% Mn, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, the product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 36
Dependent Claim
78 words
A memory disc substrate consisting essentially of about 3.5 to 4.5 wt.% Mn, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, the product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 37
Dependent Claim
94 words
A memory disc comprised of an aluminum alloy substrate, (a) the alloy consisting essentially of 0.5 to 5.6 wt.% Mg, 1 wt.% max. Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe and less than 1.0 wt% Si, 3.5 wt.% max. Zn, the remainder aluminum and impurities, the substrate characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined, and (b) a layer of memory medium provided on said substrate.
Claim 38
Dependent Claim
94 words
A memory disc comprised of an aluminum alloy substrate, (a) the alloy consisting essentially of 0.5 to 5.6 wt.% Mg, 1 wt.% max. Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe and less than 1.0 wt% Si, 3.5 wt.% max. Zn, the remainder aluminum and impurities, the substrate characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined, and (b) a layer of memory medium provided on said substrate.
Claim 39
Dependent Claim
56 words
The substrate in accordance with claim 31 wherein the alloy consists essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.5 wt.% max. Fe, 0.35 wt.% max. Si, 1 wt.% max. of both Cu and Zn, 0.25 wt.% max. Ti, the remainder aluminum and impurities.
Claim 40
Dependent Claim
19 words
The memory medium in accordance with claim 31 wherein the memory medium is comprised of a thin metallic layer.
Claim 41
Dependent Claim
22 words
The memory medium in accordance with claim 31 wherein the memory medium is comprised of iron oxide suspended in a plastic carrier.
Claim 42
Independent Claim
124 words
The method of producing a wrought aluminum alloy product, comprising the steps of: (a) providing a body of aluminum base alloy consisting essentially of 2.2 to 10 wt.% Mg, 0.1 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max, Zn, 1 wt.% max. Cu, 0.3 wt.% max. Ti, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) working said body to produce a wrought aluminum alloy product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 43
Independent Claim
124 words
The method of producing a wrought aluminum alloy product, comprising the steps of: (a) providing a body of aluminum base alloy consisting essentially of 2.2 to 10 wt.% Mg, 0.1 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max, Zn, 1 wt.% max. Cu, 0.3 wt.% max. Ti, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) working said body to produce a wrought aluminum alloy product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 44
Dependent Claim
19 words
The method in accordance with claim 35 wherein Mg is maintained in the range of 2.2 to 5.6 wt.%.
Claim 45
Dependent Claim
19 words
The method in accordance with claim 35 wherein Mg is maintained in the range of 3.5 to 4.5 wt.%.
Claim 46
Dependent Claim
19 words
The method in accordance with claim 35 wherein Mn is maintained in the range of 0.2 to 0.8 wt.%.
Claim 47
Dependent Claim
14 words
The method in accordance with claim 35 wherein Mn is less than 1 wt.%.
Claim 48
Dependent Claim
14 words
The method in accordance with claim 35 wherein Cr is less than 0.25 wt.%.
Claim 49
Dependent Claim
14 words
The method in accordance with claim 35 wherein Fe is less than 0.8 wt.%.
Claim 50
Dependent Claim
14 words
The method in accordance with claim 35 wherein Fe is less than 0.5 wt.%.
Claim 51
Dependent Claim
14 words
The method in accordance with claim 35 wherein Ti is less than 0.3 wt.%.
Claim 52
Dependent Claim
14 words
The method in accordance with claim 35 wherein Si is less than 0.5 wt.%.
Claim 53
Dependent Claim
14 words
The method in accordance with claim 35 wherein Si is less than 0.35 wt.%.
Claim 54
Dependent Claim
19 words
The method in accordance with claim 35 wherein Sr is maintained in the range of 0.005 to 0.5 wt.%.
Claim 55
Dependent Claim
19 words
The method in accordance with claim 35 wherein Sr is maintained in the range of 0.01 to 0.25 wt.%.
Claim 56
Independent Claim
124 words
A method of producing a wrought aluminum alloy product, comprising the steps of: (a) providing a body of aluminum base alloy consisting essentially of 0.5 to 5.6 wt.% Mg, about 0.2 to 1.8 wt.% Mn, 0.25 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.3 wt.% max. Ti, 0.5 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) working said body to produce a wrought aluminum alloy product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 57
Independent Claim
124 words
A method of producing a wrought aluminum alloy product, comprising the steps of: (a) providing a body of aluminum base alloy consisting essentially of 0.5 to 5.6 wt.% Mg, about 0.2 to 1.8 wt.% Mn, 0.25 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.3 wt.% max. Ti, 0.5 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) working said body to produce a wrought aluminum alloy product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 58
Independent Claim
125 words
A method of producing an aluminum alloy flat rolled product, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a flat rolled product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 59
Independent Claim
125 words
A method of producing an aluminum alloy flat rolled product, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 10 wt.% Mg, about 0.2 to 1.6 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a flat rolled product being characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined.
Claim 60
Dependent Claim
59 words
The method in accordance with claim 49 consisting essentially of 2.2 to 5.6 wt.% Mg, 0.1 to 1 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.25 wt.% max. Si, 0.4 wt.% max. Fe, 0.1 wt.% max. of both Cu and Zn, the balance aluminum and impurities, the total of impurities not exceeding 0.15 wt.%.
Claim 61
Dependent Claim
12 words
The method in accordance with claim 49 wherein said product is sheet.
Claim 62
Independent Claim
134 words
A method of producing a wrought aluminum alloy sheet product suitable for machining and using as substrates, including memory disc substrates, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting of 0.5 to 10 wt.% Mg, about 0.2 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a wrought aluminum alloy sheet product characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 63
Independent Claim
134 words
A method of producing a wrought aluminum alloy sheet product suitable for machining and using as substrates, including memory disc substrates, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting of 0.5 to 10 wt.% Mg, about 0.2 to 1.4 wt.% Mn, 0 to 0.35 wt.% Cr, 0.005 to 0 wt.% Sr, 0.04 to 1 wt.% Fe, 1 wt.% max. Si, 3.5 wt.% max. Zn, 1 wt.% max. Cu, the remainder aluminum and incidental impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a wrought aluminum alloy sheet product characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 64
Dependent Claim
18 words
The method in accordance with claim 52 wherein Mg is in the range of 0.5 to 5.6 wt.%.
Claim 65
Dependent Claim
18 words
The method in accordance with claim 52 wherein Mg is in the range of 3.5 to 4.5 wt.%.
Claim 66
Dependent Claim
18 words
The method in accordance with claim 52 wherein Mn is in the range of 0.2 to 0.8 wt.%.
Claim 67
Dependent Claim
14 words
The method in accordance with claim 52 wherein Mn is less than 1 wt.%.
Claim 68
Dependent Claim
18 words
The method in accordance with claim 52 wherein Cr is in the range of 0.05 to 0.25 wt.%.
Claim 69
Dependent Claim
14 words
The method in accordance with claim 52 wherein Fe is less than 0.5 wt.%.
Claim 70
Dependent Claim
14 words
The method in accordance with claim 52 wherein Zn is less than 0.25 wt.%.
Claim 71
Dependent Claim
14 words
The method in accordance with claim 52 wherein Ti is less than 0.15 wt.%.
Claim 72
Dependent Claim
18 words
The method in accordance with claim 52 wherein Sr is in the range of 0.005 to 0.5 wt.%.
Claim 73
Dependent Claim
14 words
The method in accordance with claim 52 wherein Si is less than 0.35 wt.%.
Claim 74
Independent Claim
129 words
A method of producing a wrought aluminum alloy sheet product suitable for machining and using as memory disc substrate, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a sheet product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 75
Independent Claim
129 words
A method of producing a wrought aluminum alloy sheet product suitable for machining and using as memory disc substrate, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and Ti, the remainder aluminum and impurities, (b) heating the body to a temperature of not greater than 1100° F., and (c) hot rolling said body to produce a sheet product characterized by the presence of at least one intermetallic phase of the type consisting of Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein one of such phases is refined.
Claim 76
Independent Claim
190 words
A method of producing a memory disc comprised of an aluminum alloy substrate and a layer of memory medium, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 5.6 wt.% Mg, 1 wt.% max. Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe and less than 1.0 wt.% Si, 3.5 wt.% max. Zn, the remainder aluminum and impurities, (b) heating the body to a temperature of not greater than 1100° F., (c) rolling said body to a sheet product, with said rolling being completed at a temperature in the range of 400° F. to 600° F., (d) cold rolling the sheet product to a final gauge, the sheet characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined, (e) stamping a memory disc substrate from said cold rolled sheet, (f) machining said substrate to provide a smooth surface thereon, said (g) depositing a layer of memory medium on said substrate to provide the memory disc.
Claim 77
Independent Claim
190 words
A method of producing a memory disc comprised of an aluminum alloy substrate and a layer of memory medium, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 5.6 wt.% Mg, 1 wt.% max. Mn, 0 to 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 1 wt.% Fe and less than 1.0 wt.% Si, 3.5 wt.% max. Zn, the remainder aluminum and impurities, (b) heating the body to a temperature of not greater than 1100° F., (c) rolling said body to a sheet product, with said rolling being completed at a temperature in the range of 400° F. to 600° F., (d) cold rolling the sheet product to a final gauge, the sheet characterized by the presence of at least one intermetallic phase of the type containing Al-Fe-Si, Al-Fe-Mn and Al-Fe-Mn-Si, wherein at least one of such phases is refined, (e) stamping a memory disc substrate from said cold rolled sheet, (f) machining said substrate to provide a smooth surface thereon, said (g) depositing a layer of memory medium on said substrate to provide the memory disc.
Claim 78
Dependent Claim
56 words
The substrate in accordance with claim 64 wherein the alloy consists essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% Cr, 0.005 to 0.5 wt.% Sr, 0.5 wt.% max. Fe, 0.35 wt.% max. Si, 1 wt.% max. of both Cu and Zn, 0.25 wt.% max. Ti, the remainder aluminum and impurities.
Claim 79
Dependent Claim
19 words
The memory medium in accordance with claim 64 wherein the memory medium is comprised of a thin metallic layer.
Claim 80
Dependent Claim
22 words
The memory medium in accordance with claim 64 wherein the memory medium is comprised of iron oxide suspended in a plastic carrier.
Claim 81
Dependent Claim
24 words
The method in accordance with claim 64 wherein the body is rolled at a temperature in the range of 600° F. to 1050° F.
Claim 82
Dependent Claim
42 words
The method in accordance with claim 64 wherein the body is rolled at a temperature in the range of 750° F. to 950° F. with said hot rolling being completed at a temperature in the range of 400° F. to 600° F.
Claim 83
Dependent Claim
42 words
The method in accordance with claim 64 wherein the body is subjected to a homogenization treatment prior to said hot rolling step, said treatment being at a temperature of 900° F. to 1100° F. for a period of at least 1 hour.
Claim 84
Dependent Claim
24 words
The method in accordance with claim 64 wherein the body is hot rolled to a gauge in the range of 0.125 to 0.25 inch.
Claim 85
Dependent Claim
24 words
The method in accordance with claim 64 wherein the product is cold rolled to a gauge in the range of 0.058 to 0.162 inch.
Claim 86
Dependent Claim
37 words
The method in accordance with claim 64 including thermally flattening said substrates at a temperature in the range of 420° F. to 750° F. for a period of time in the range of 1 to 5 hours.
Claim 87
Independent Claim
242 words
A method of producing a memory disc having a substrate of an aluminum base alloy and a layer of memory medium thereon, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and ti, the remainder aluminum and impurities, (b) subjecting said body to a homogenization treatment at a temperature in the range of 900° F. to 1100° F. for a period of at least 2 hours, (c) thereafter rolling said body at a temperature in the range of 750° F. to 950° F. with said rolling being completed at a temperature in the range of 400° F. to 600° F., said rolling being to a gauge in the range of 0.125 to 0.25 inch, (d) cold rolling the hot rolled product to a sheet product having a gauge in the range of 0.058 to 0.162 inch, (e) stamping memory disc substrates from said sheet product and subjecting the substrate to a thermal flattening treatment at a temperature in the range of 425° F. to 750° F. for a period of 1 to 5 hours, (f) machining the substrate to a smooth surface, and (g) after cleaning the surface of the substrate, providing a layer of memory medium thereon.
Claim 88
Independent Claim
242 words
A method of producing a memory disc having a substrate of an aluminum base alloy and a layer of memory medium thereon, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 3.5 to 4.5 wt.% Mg, 0.1 to 1 wt.% Mn, 0.35 wt.% max. Cr, 0.005 to 0.5 wt.% Sr, 0.04 to 0.5 wt.% Fe, 0.35 wt.% max. Si, 0.25 wt.% max. each of Zn, Cu and ti, the remainder aluminum and impurities, (b) subjecting said body to a homogenization treatment at a temperature in the range of 900° F. to 1100° F. for a period of at least 2 hours, (c) thereafter rolling said body at a temperature in the range of 750° F. to 950° F. with said rolling being completed at a temperature in the range of 400° F. to 600° F., said rolling being to a gauge in the range of 0.125 to 0.25 inch, (d) cold rolling the hot rolled product to a sheet product having a gauge in the range of 0.058 to 0.162 inch, (e) stamping memory disc substrates from said sheet product and subjecting the substrate to a thermal flattening treatment at a temperature in the range of 425° F. to 750° F. for a period of 1 to 5 hours, (f) machining the substrate to a smooth surface, and (g) after cleaning the surface of the substrate, providing a layer of memory medium thereon.
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |