Patent ID: 6059902
Filing Date: 2000-05-09
Classification: C22C,C22F

Abstract:
A method of manufacturing an aluminum alloy, which comprises casting an aluminum alloy containing Si: 1.5 to less than 6% and Mg: 0.5-6% to obtain a cast ingot having DAS (Dendrite Arm Spacing) of from 10 to 50 .mu.m, subjecting said ingot to a soaking treatment at 450-520.degree. C. and then to extrusion molding, wherein second-phase grains in said alloy comprise Si and/or Si system compounds, said second phase grains are crystallized from a melt of said alloy, and said second phase grains have an average grain size of 2 to 20 .mu.m and an area ratio of 2 to 12%.