Patent ID: 6332906
Filing Date: 2001-12-25
Classification: B22F,C22C,C22F,G11B

Abstract:
An extruded article formed by a process comprising the steps of(a) forming atomized particulates consisting essentially of from about 20 to about 40% by weight magnesium and the balance aluminum, the particulates having a particle size of from about 8 to about 35 microns and comprising a microstructure of silicon particles of from about 1 to about 10 microns in an aluminum matrix;(b) compacting the particulates in a mold;(c) subjecting the compacted particulates to a vacuum of less than about 10 torr absolute pressure to remove air and other gaseous materials from between the particulates and the mold;(d) isostatically compressing the particulates to a pressure of at least about 30,000 psi and at a temperature of less than about 100.degree. C., thereby forming a green billet;(e) vacuum sintering the green billet under a vacuum of less than about 100 torr absolute pressure and/or an inert as environment at a temperature less than that which substantially affects the particulate microstructure, thereby forming a sintered billet; and(f) extruding the sintered billet and forming metal to metal bonds between the sintered particulates of the billet, thereby forming the extruded article.