METHOD OF HEAT-TREATMENT OF ALUMINUM ALLOYS

摘要

A method of heat treatment of aluminum alloys of the type Al-Mg-Si for the purpose of improvement of the processibility by extruding, which comprises the steps of subjecting said alloys to a homogenization-glowing at 530 DEG C to 580 DEG C, and cooling and alloys to a temperature range of 230 DEG C to 270 DEG C, while maintaining a substantially uniform temperature gradient. The cooling step takes place at a speed of at least 100 DEG C/h without quenching, and a holding period is maintained within the temperature range of 230 DEG C to 270 DEG C, for a time period of about 4 to 24 hours, whereupon further cooling or heating to working temperature of said alloys is performed.