A process for the preparation of readily deformable of slightly eared aluminum sheets with high mechanical strength

摘要

A method of manufacture of sheets, strips and foils with high mechanical strength, good deformability, and very little formation of ears, from age hardenable aluminum alloys of the Al-Si-Mg type by continuous casting or strip casting and hot and cold rolling, characterized in that an Al-Mg-Si-alloy is employed, which contains an insoluble excess of silicon at a temperature of 450 DEG to 550 DEG C. usual for homogenization annealing for this type of alloy, this excess remaining in defined finely dispersed form in the matrix, when the alloy is subjected to such a heat treatment; the alloy having preferably a composition corresponding to the area A-B-C-D-A of FIG. 1 of the accompanying drawings, where A=1% Si/0.6% Mg (weight percent), B=1.8% Si/0.6% Mg, C=1.8% Si/0.2% Mg and D=1.2% Si/0.2% Mg, with facultatively additions of a maximum of 0.3% each of chromium, manganese, zirconium and/or titanium.