Aluminum - silicon - diecasting alloy, a process for the preparation of a pressure casting component out of the alloy and the vehicle body component with a diecast component

摘要

The present invention relates to an adhesive aluminum - silicon - diecasting alloy for the manufacture of a pressure casting component, in particular of a thin-walled vehicle body component for a motor vehicle, comprising 6,5 wt.% to 12,0 wt.% silicon, 0,30 wt.% to 0,80 wt.% manganese, 0,25 wt.% to 0,50 wt.% magnesium, 0,08 wt.% to 0,35 wt.% zinc, 0,05 wt.% to 0,30 wt.% zirconium, 0,006 wt.% to 0,025 wt.% strontium, individually not more than 0,3 wt.%, a total of not more than 0,5% by wt.% impurities and the remainder is aluminium. The present invention also relates to a process for the production of a pressure casting component, in particular for a thin-walled vehicle body component, comprising the steps of: casting a pressure casting component made from an aluminum - silicon - diecasting alloy according to the present invention and subjecting the pressure casting component comprising a heat treatment in the sequence indicated, a multi-stage annealing comprising at least a first annealing at a temperature in the range of 320°C. to 450°C for a period of time of 20 minutes to 75 minutes, and a second annealing at a temperature in the range from 460°C. to 520°C for a period of time of 5 minutes to 35 minutes, a quenching with a temperature gradient in the range from 3 k / s to 200 k / s, and a multistage artificial aging including at least one first artificial ageing at a temperature in the range of from 100°C. to 180°C for a period of time of 40 minutes to 150 minutes, and a second artificial ageing at a temperature in the range of 195°C. to 300°C for a period of time of 30 minutes to 100 minutes.