US4053331A
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Method of making amorphous metallic alloys having enhanced magnetic properties by using tensile stress
Assignee: University of Pennsylvania
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Filing: 1976-07-29
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Granted: 1977-10-11
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Expires: 1996-07-29
Abstract
Abstract The magnetic properties of amorphous metallic alloys are improved significantly by application of stress to the alloy material. Selected alloys in ribbon form are subjected to controlled tensile stress, whereupon resulting magnetic properties are superior to corresponding conventional crystalline materials. So stressed, the amorphous alloy material may be applied to advantage as transformer cores, magnetic delay lines, magnetic computer cores, and the like.
Inventors
- 👤 Charles D. Graham, Jr.
- 👤 Philip J. Flanders
- 👤 Takeshi Egami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:20
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15358
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A method of providing a metal having superior magnetic properties, including low coercivity and high permeability, comprising the steps of: a. selecting a metal from the group consisting of the substantially amorphous, noncrystalline metallic magnetic alloys having positive magnetostriction; b. subjecting said alloy to a tensile stress less than the elastic limit of the alloy; and c. sustaining said tensile stress, thereby producing, during said sustaining step, an amorphous alloy having superior soft magnetic properties including low coercivity and high permeability.
Claim 2
Independent Claim
81 words
A method of providing a metal having superior magnetic properties, including low coercivity and high permeability, comprising the steps of: a. selecting a metal from the group consisting of the substantially amorphous, noncrystalline metallic magnetic alloys having positive magnetostriction; b. subjecting said alloy to a tensile stress less than the elastic limit of the alloy; and c. sustaining said tensile stress, thereby producing, during said sustaining step, an amorphous alloy having superior soft magnetic properties including low coercivity and high permeability.
Claim 3
Dependent Claim
27 words
A method as described in claim 1 wherein said selecting step includes selecting an amorphous metal from the group having a majority proportion of nickel and iron.
Claim 4
Dependent Claim
26 words
A method as described in claim 1 wherein said alloy material consists essentially of, by atomic percent: nickel 40%; iron 40%; phosphorous 14%; and boron 6%.
Claim 5
Dependent Claim
24 words
A method as described in claim 1 wherein said alloy material is selected from the group having at least a majority proportion of iron.
Claim 6
Dependent Claim
26 words
A method as described in claim 4 wherein said alloy material consists essentially of, by atomic percent: iron 80%; phosphorous 16%; carbon 3%; and boron, 1%.
Claim 7
Dependent Claim
19 words
A method as described in claim 1 wherein said subjecting step comprises placing elastic tensile stress on said material.
Claim 8
Dependent Claim
40 words
A method as described in claim 1 wherein said subjecting step includes the steps of gradually increasing the stress on said material to a point above which no further change is experienced in coercivity, and then ceasing said stress increase.
Claim 9
Dependent Claim
42 words
A method as described in claim 7 wherein said subjecting step includes the steps of gradually increasing the stress on said material beyond said point and still further until no further increase is experienced in remanence, and then ceasing said stress increase.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |