The DSC spectrum of the AlSi1MgMn alloy with 0.05 wt% Cu confirms the well established precipitation sequence for ternary Al-Mg-Si alloys: supersaturated solid solution -> GP zones -> beta" -> beta' -> beta. The precipitation activities are displaced to lower temperatures with increasing Cu concentration. Additional Cu -bearing metastable precipitates, L, Q and theta, are evidenced by the change in the peak configuration in the DSC spectra of Cu -added AlSilMgMn alloys. The following precipitation sequences; SSSS -> GP -> theta' -> L -> beta" -> Q' -> beta' -> beta/Q/theta and SSS -> GP -> theta" ->theta' -> L -> beta" -> beta'-> beta/theta offer a plausible account of the revised peak configurations in the DSC spectra of the AlSiMgMn alloy with 0.15 wt% Cu and with at least 0.3 wt% Cu, respectively. (C) 2017 Elsevier B.V. All rights reserved.