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US4770850A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnesium-calcium-nickel/copper alloys and articles

Assignee: United States Department of the Air Force
•
Filing: 1987-10-01
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Granted: 1988-09-13
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Expires: 2007-10-01
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Abstract

Abstract A novel magnesium alloy consisting essentially of about 6 to 14 weight percent calcium, about 4 to 8 weight percent of copper or nickel, balance magnesium. There is also provided a process for producing a magnesium alloy article having improved properties which comprises the steps of providing a rapidly solidified product having the composition defined above and having a maximum average thickness of about 200 microns in at least one dimension, introducing the rapidly solidified product into a mold, and consolidating the rapidly solidified product to obtain a desired densification of the rapidly solidified product. Consolidation may be carried out by hot isostatic pressing (HIP'ing) the rapidly solidified product at a pressure of about 100 to 300 MPa and a temperature of about 150 DEG to 350 DEG C. for a time sufficient to obtain the desired densification. Alternatively, consolidation may be accomplished by extrusion using the same temperature range, and an extrusion ratio of about 10:1 to 30:1.

Inventors

  • 👤 Franz J. Hehmann
  • 👤 Setumadhavan Krishnamurthy
  • 👤 Erica Robertson
  • 👤 Steven J. Savage
  • 👤 Francis H. Froes

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 08:10
CPC Classifications
C; C22; C22C; C22C23/00; B; B22; B22F; B22F9/00; B22F9/002; B22F9/008; B22F9/02; B22F9/06; C22C1/00; C22C1/04; C22C1/0408

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 26 words
A magnesium alloy consisting essentially of about 6 to 14 weight percent calcium and about 4 to 8 weight percent of nickel or copper, balance magnesium.
Claim 2
Dependent Claim 26 words
A magnesium alloy consisting essentially of about 6 to 14 weight percent calcium and about 4 to 8 weight percent of nickel or copper, balance magnesium.
Claim 3
Dependent Claim 19 words
The alloy of claim 1 containing about 6.0 weight percent calcium and about 6.0 weight percent copper, balance magnesium.
Claim 4
Dependent Claim 19 words
The alloy of claim 1 containing about 10.5 weight percent calcium and about 6.0 weight percent copper, balance magnesium.
Claim 5
Dependent Claim 19 words
The alloy of claim 1 containing about 14.0 weight percent calcium and about 6.0 weight percent copper, balance magnesium.
Claim 6
Dependent Claim 19 words
The alloy of claim 1 containing about 6.0 weight percent calcium and about 5.6 weight percent nickel, balance magnesium.
Claim 7
Dependent Claim 19 words
The alloy of claim 1 containing about 10.5 weight percent calcium and about 5.6 weight percent nickel, balance magnesium.
Claim 8
Dependent Claim 19 words
The alloy of claim 1 containing about 14.0 weight percent calcium and about 5.6 weight percent nickel, balance magnesium.
Claim 9
Independent Claim 77 words
The method for producing a magnesium alloy article which comprises the steps of providing a rapidly solidified product consisting essentially of about 6 to 14 weight percent calcium, about 4 to 8 weight percent nickel or copper, balance magnesium having a maximum average thickness of about 200 microns in at least one dimension, introducing the rapidly solidified product. into a mold, and consolidating the rapidly solidified product to obtain a desired densification of said rapidly solidified product.
Claim 10
Independent Claim 77 words
The method for producing a magnesium alloy article which comprises the steps of providing a rapidly solidified product consisting essentially of about 6 to 14 weight percent calcium, about 4 to 8 weight percent nickel or copper, balance magnesium having a maximum average thickness of about 200 microns in at least one dimension, introducing the rapidly solidified product. into a mold, and consolidating the rapidly solidified product to obtain a desired densification of said rapidly solidified product.
Claim 11
Dependent Claim 46 words
The method of claim 8 wherein consolidation is carried out by hot isostatic pressing at a pressure of about 100 to 300 MPa and a temperature of about 150° to 350° C. for a time sufficient to obtain a desired densification of said rapidly solidified product.
Claim 12
Dependent Claim 33 words
The method of claim 8 wherein consolidation is carried out by extrusion using an extrusion ratio in the range of about 10:1 to 30:1 and a temperature of about 150° to 350° C.

References Cited (Backward Citations)

US2124557A Cited
US2221245A Cited
US2233008A Cited
US2823996A Cited
SU144991A1 Cited
US4439379A Cited
US4460407A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-09-13 1992-03-14 1992-09-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-09-13 1996-03-14 1996-09-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-09-13 2000-03-14 2000-09-13 $7700.00 Window Closed / Lapsed

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