| 主权项 |
1. A method for producing high strength aluminum alloy billets containing L12 dispersoids comprising:
Al3X dispersoids wherein X is
at least one first element selected from the group consisting of 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 21.0 weight percent lutetium; andat least one second element of about 0.05 to about 2.0 weight percent hafnium; at least one third element selected from the group consisting of about 4 to about 25 weight percent silicon, about 0.5 to about 3 weight percent lithium, about 0.2 to about 6.5 weight percent copper, about 3 to about 12 weight percent zinc, and about 1 to about 12 weight percent nickel; and the balance substantially aluminum, the method comprising the steps of:
melting an aluminum alloy containing L12 dispersoid forming elements therein;forcing the melted alloy through a gas atomization nozzle;contacting the melted alloy stream leaving the nozzle with a high pressure inert gas stream having a dew point from about −50° F. (−45.5° C.) to about −100° F. (−73° C.) to form a spray of liquid droplets;directing the spray of liquid droplets at a substrate;contacting a sufficient quantity of the liquid droplets on a rotating substrate prior to solidification to form a desired quantity of solidified alloy; andremoving the alloy from the substrate after solidification in the form of a billet. |
