Method of forming high strength aluminum alloy parts containing L1₂intermetallic dispersoids by ring rolling

摘要

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.

主权项

1. A method for forming a ring rolled high strength aluminum alloy part containing L12 dispersoids, comprising the steps of:
placing a quantity of a powder containing L12 Al3X dispersoids in an aluminum alloy matrix consisting of a matrix element that is 4-25 weight % silicon, 0.2-6 weight % copper and/or 3-12 weight % zinc, and the balance aluminum in a container wherein X is at least one first element selected from the group consisting of 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; and at least one second element selected from the group consisting of about 0.1 to about 20.0 weight percent gadolinium, about 0.1 to about 20.0 weight percent yttrium, and about 0.05 to about 10.0 weight percent hafnium; 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 degassed 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 using an anvil and hammer, such that the preform is donut shaped, having a first diameter and wall thickness; and ring rolling the preform to substantially decrease the wall thickness and increase the diameter into a finished product.