Abstract
Although heat treatable Al-Si-Mg-based 6000 alloys have become increasingly attractive for automotive skin panel applications, the potential of these alloys is not fully explored in the current automotive body paint bake cycle due to a low temperature and a short duration. In order to improve the bake hardening response in such a cycle, many efforts have been made in past years by means of microstructural modification. This paper presents our recent results in developing pre-aged (T4P) Al-Si-Mg alloys. Two types of processes have been investigated which differ in the holding time between the solid solution heat treatment and the pre-ageing heat treatment, and can be denoted (a) fresh pre-ageing treatment and (b) reversion pre-ageing treatment. The mechanism of microstructural evolution during these processes is discussed, also considering the effect of processing parameters and alloy chemistry on the bake hardening response.
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