Patent ID: 8603267
Filing Date: 2013-12-10
Classification: B21C,C22C,C22F

Abstract:
1. A method of extruding an aluminum-based alloy, comprising the steps of: selecting an aluminum-based alloy billet, wherein the aluminum based alloy is selected from the group consisting of a devitrified alloy having a nanocrystalline microstructure and a glassy aluminum alloy having substantially no devitrification; soaking the billet for sufficient time to heat the billet to an extrusion starting temperature of from about 450° F. to about 550° F. (232.2° C. to 287.9° C.), wherein a time for the soaking is from about 10 minutes to about 72 hours; extruding the billet in a streamline die having an extrusion ratio sufficient to keep the adiabatic temperature below the starting temperature while maintaining the streamline die at a temperature of about 400° F. to about 600° F. (204.4° C. to 315.6° C.) at a ram speed less than that which would raise the streamline die temperature within this range; and removing the extruded billet from the die.