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3. For automotive outer panel application a characteristic two-step age-hardening process is beneficially employed for AlMgSi alloys ( 26 ) in which the “seeds” of the precipitates are prepared with appropriate pre-aging in Al factories whereas the effective hardening precipitates will form rapidly upon a short annealing (paint bake cycles) in car manufacturing plants. After pre-aging the alloys must (i) be sufficiently soft for good formability and (ii) form certain particles for the quick-bake hardening response upon the second heating.
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