Reynolds Metals Company developed a heat treatment process which is effective in increasing the paint bake response of Al alloys for automotive body panels by up to a factor of four, while improving the formability of the alloys and reducing the natural aging rate. The mechanism of pre-aging results from changes in the precipitation sequence of metastable variants of Mg2Si, with an increase in the precipitation kinetics during the paint bake cycle and a finer distribution of strengthening precipitates in the painted component. Through the use of pre-aging, AA6111 autobody sheets may be produced with superior stamping performance and higher strength in stamped and painted components, resulting in automotive body panels with higher dent resistance.
Effects of pre-aging treatments on formability and paint bake response in aluminum autobody sheet alloys
1997
18 Seiten, 30 Quellen
Conference paper
English
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