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US 2011/0085932 A1Published application
Method of forming high strength aluminum alloy parts containing l12 intermetallic dispersoids by ring rolling
AssigneeUnited Technologies Corporation
InventorAwadh B. Pandey
Life of this patent
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Abstract
A method and apparatus produces high strength aluminum alloy parts from a powder containing L12 intermetallic dispersoids. The powder is degassed, sealed under vacuum in a container, heated, consolidated into billet form by vacuum hot pressing. The billet is then shaped into a ring preform by extrusion, forging or rolling. The preform is then ring rolled to form a useful part.
Claims20
A method for forming a ring rolled high strength aluminum alloy part containing L12 dispersoids, comprising the steps of:
- placing a quantity of an aluminum alloy powder containing an L12 dispersoid comprise Al3X dispersoids in a container wherein X is at least one first element selected from the group comprising about 0.1 to about 4.0 weight percent scandium, about 0.1 to about 20.0 weight percent erbium, about 0.1 to about 15.0 weight percent thulium, about 0.1 to about 25.0 weight percent ytterbium, and about 0.1 to about 25.0 weight percent lutetium;
- at least one second element selected from the group comprising about 0.1 to about 20.0 weight percent gadolinium, about 0.1 to about 20.0 weight percent yttrium, about 0.05 to about 4.0 weight percent zirconium, about 0.05 to about 10.0 weight percent titanium, about 0.05 to about 10.0 weight percent hafnium, and about 0.05 to about 5.0 weight percent niobium;
- and the balance substantially aluminum, the powder having a mesh size of less than 450 mesh;
- vacuum degassing the powder at a temperature of about 300° F. (149° C.) to about 900° F. (482° C.) for about 0.5 hours to about 8 days;
- sealing the degas sed powder in the container under vacuum;
- heating the sealed container to about 300° F. (149° C.) to about 900° F. (482° C.) for about 15 minutes to eight hours;
- vacuum hot pressing the heated container to form a billet;
- removing the container from the formed billet;
- forging the billet into a ring preform;
- and
- ring rolling the preform into a finished product.
8 more elements
Apparatus for producing a ring rolled high strength aluminum alloy part containing L12 dispersoids, comprising:
- a container for holding a quantity of an aluminum alloy powder containing an L12 dispersoid comprising Al3X dispersoids wherein X is at least one first element selected from the group comprising about 0.1 to about 4.0 weight percent scandium, about 0.1 to about 20.0 weight percent erbium, about 0.1 to about 15.0 weight percent thulium, about 0.1 to about 25.0 weight percent ytterbium, and about 0.1 to about 25.0 weight percent lutetium;
- at least one second element selected from the group comprising about 0.1 to about 20.0 weight percent gadolinium, about 0.1 to about 20.0 weight percent yttrium, about 0.05 to about 4.0 weight percent zirconium, about 0.05 to about 10.0 weight percent titanium, about 0.05 to about 10.0 weight percent hafnium, and about 0.05 to about 5.0 weight percent niobium;
- and the balance substantially aluminum, the powder having a mesh size of less than 450 mesh;
- a vacuum and heat source for degassing the powder at a temperature of about 300° F. (149° C.) to about 900° F. (482° C.) for about 0.5 hours to about 8 days;
- sealing means for sealing the degassed powder in the container under vacuum;
- heating means for heating the sealed container at about 300° F. (149° C.) to about 900° F. (482° C.) for about 15 minutes to eight hours;
- a vacuum hot press for forming the heated container into a billet;
- means for removing the container from the thus formed billet;
- means for forging the billet into a ring preform;
- and
- ring rolling means for rolling the preform into a finished product.
8 more elements
Dependencies are inferred from the claim text.