US4765954A
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Rapidly solidified high strength, corrosion resistant magnesium base metal alloys
Assignee: Honeywell International Inc
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Filing: 1985-09-30
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Granted: 1988-08-23
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Expires: 2005-09-30
Abstract
Abstract A rapidly solidified magnesium based alloy contains finely dispersed magnesium intermetallic phases. The alloy has the form of a filament or a powder and is especially suited for consolidation into bulk shapes having superior combination of strength, ductility and corrosion resistance.
Inventors
- 👤 Santosh K. Das
- 👤 Chin-Fong Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:56
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0408; B; B22; B22F; B22F9/00; B22F9/002; B22F9/008; C22C45/00; C22C45/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
131 words
A rapidly solidified magnesium based alloy consisting essentially of the formula Mg bal Al a Zn b X c , wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium, yttrium and silver, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent, said alloy having a microstructure comprised of a subtantially uniform cellular network of solid solution phase of a size ranging from 0.2-1.0 μm together with recipitates of magnesium containing intermetallic phases of a size less than 0.5 μm.
Claim 2
Dependent Claim
131 words
A rapidly solidified magnesium based alloy consisting essentially of the formula Mg bal Al a Zn b X c , wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium, yttrium and silver, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent, said alloy having a microstructure comprised of a subtantially uniform cellular network of solid solution phase of a size ranging from 0.2-1.0 μm together with recipitates of magnesium containing intermetallic phases of a size less than 0.5 μm.
Claim 3
Dependent Claim
14 words
The alloy of claim 1 wherein said alloy having the form of a ribbon.
Claim 4
Dependent Claim
21 words
The alloy of claim 2 wherein said ribbon has a hardness of at least about 125 kg/mm 2 at room temperature.
Claim 5
Dependent Claim
20 words
An alloy as recited in claim 2, wherein said ribbon has a thickness ranging from about 25 to 100 μm.
Claim 6
Dependent Claim
14 words
An alloy as recited in claim 2, wherein said ribbon is a continuous strip.
Claim 7
Dependent Claim
14 words
The alloy of claim 1 wherein said alloy having the form of a powder.
Claim 8
Dependent Claim
36 words
An alloy as recited in claim 1 wherein said alloy, when immersed in a 3 perent NaCl aqueous solution at 25° C. for 96 hours, has a corrosion rate of less than 50 mils per year.
Claim 9
Independent Claim
193 words
A method for making a magnesium containing alloy having a composition consisting essentially of the formula Mg bal Al a Zn b X c , wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, paraseodymium, yttrium and silver, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent, said method comprising the steps of: (a) forming a melt of said alloy in a protective environment; and (b) quenching said melt in said protective environment at a rate of at least about 10 5 ° C./sec by directing said melt into contact with a rapidly moving chilled surface to form thereby a rapidly solidified ribbon of said alloy, having a microstructure comprised of a substantially uniform cellular network of solid solution phase of a size ranging from 0.2-1.0 μm together with precipitates of magnesium containing intermetallic phases of a size less than 0.5 μm.
Claim 10
Independent Claim
193 words
A method for making a magnesium containing alloy having a composition consisting essentially of the formula Mg bal Al a Zn b X c , wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, paraseodymium, yttrium and silver, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent, said method comprising the steps of: (a) forming a melt of said alloy in a protective environment; and (b) quenching said melt in said protective environment at a rate of at least about 10 5 ° C./sec by directing said melt into contact with a rapidly moving chilled surface to form thereby a rapidly solidified ribbon of said alloy, having a microstructure comprised of a substantially uniform cellular network of solid solution phase of a size ranging from 0.2-1.0 μm together with precipitates of magnesium containing intermetallic phases of a size less than 0.5 μm.
Claim 11
Dependent Claim
17 words
The method of claim 8 additionally comprising the step of comminuting said ribbon to form a powder.
Claim 12
Dependent Claim
10 words
A metal article consolidated from the powder of claim 9.
Claim 13
Dependent Claim
34 words
The method of claim 9 wherein said powder comprises platelets having an average thickness of less than 100 μm, said platelets being characterized by irregular shapes resulting from fracture of the ribbon during comminution.
Claim 14
Dependent Claim
25 words
The method of claim 11, further comprising the step of forming said powder into a consolidated body by the application thereto of pressure and heat.
Claim 15
Dependent Claim
23 words
The method of claim 11, further comprising the step of forming said powder into a consolidated body by the application thereto of pressure.
Claim 16
Dependent Claim
91 words
The method of claim 13 wherein said alloy has a microstructure and the consolidated body is heated to a temperature in the range of 150° C. to 300° C. for 24 hours, said microstructure having a fine grain size of about 0.36 to 0.70 μm with substantially uniform dispersion of ultrafine precipitates of intermetallic phases formed between magneium and one or more of said elements from the group X consisting of manganese, cerium, neodymium, paraseodymium yttrium and silver, said ultrafine precipitates having a characteristic size of less than about 0.5 μm.
Claim 17
Dependent Claim
62 words
A metal article consolidated as recited in claim 13, wherein said article is composed of magnesium solid solution phase containing a substantially uniform distribution of dispersed, intermetallic phase precipitates formed between magnesium and at least one element of the group X consisting of manganese, cerium, neodymium, paraseodymium, yttrium and silver, said precipitates having a characteristic size of less than about 0.5 μm.
References Cited (Backward Citations)
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