Heterogeneous Formation of Nanoclusters in a Cold Rolled 6000 Series Aluminum Alloy
Abstract
The effect of high densities of dislocations on the formation behavior of nanoscale clusters (nanoclusters), which are formed during natural aging at room temperature and the pre-aging at ~373 K in a 6000 series aluminum alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the two types of nanoclusters and also the precipitation sequence, which involve a strengthening phase (Ë) to improve the bake-hardening (BH) response for auto body panels. Cold rolling to a 5% deformation accelerates the preferential formation of nanocluster at 373K along dislocations in addition to homogeneous nucleation in the crystal grains. Atom probe tomography demonstrate the heterogeneous formation of nanocluster during pre-aging at 373K. The Ë phase shows the high growth rate at the same level of the as-quenched specimen in the cold rolled alloy on the aging curve at 443K. Cold rolling before pre-aging is an effective process to improve the BH response of the alloys.
Keywords
Nanocluster, Atom probe tomography, Dislocation, Al-Mg-Si alloys
DOI
10.12783/dtetr/icmme2017/9136
10.12783/dtetr/icmme2017/9136
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