| 摘要 |
A method of producing an aluminium article comprising the steps of: (a) providing stock including an aluminium alloy comprising about 1.0 to 1.3 wt.% silicon, about .40 to .80 wt.% magnesium, about .02 to .20 wt.% of an element selected from the group consisting of manganese and chromium, not more than about .70 wt% copper, the remainder substantially aluminum, incidental elements and impurities; (b) hot rolling the stock; (c) solution heat treating; (d) rapid quenching to a threshold temperature of about 200 degrees F; (e) cooling to room temperature; (f) holding at room temperature for not more than 6 hours; and (g) reheating to a temperature of about 200 degrees F. The figure shows a controlled heat pattern of cooling after solution heat treatment according to the present invention compared to the prior art.
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