TY - JOUR N2 - The scope of this work is to investigate the precipitation of two Al-Mg-Si alloys with and without Cu and excess Si by using the differential scanning calorimetry (DSC), transmission electron microscopic (TEM), Vickers hardness measurement and X-ray diffraction. The analysis of the DSC curves found that the excess Si accelerate the precipitation and the alloy contain the excess Si and small addition of copper has higher aging-hardness than that of free alloy (without excess Si and Cu) at the same heat treatment condition. The sufficient holding time for the precipitation of the β'' phase was estimated to be 6 hours for the alloy aged at 100°C and 10 hours for the alloy aged at 180°C. The low Copper containing Al-Mg-Si alloy gives rise to the forming a finer distribution of β (Mg2Si) precipitates which increases the hardness of the alloy. In order to know more about the precipitation reactions, concern the peaks on the DSC curve transmission electron microscopy observation were made on samples annealed at temperatures (250°C, 290°C and 400°C) just above the corresponding peaks of the three phases β'', β' and β respectively. L1 - http://journals.pan.pl/Content/109129/PDF/AMM-2018-4-10-Ziar.pdf L2 - http://journals.pan.pl/Content/109129 PY - 2018 IS - No 4 EP - 1648 DO - 10.24425/amm.2018.125088 KW - Al-Mg-Si alloys KW - precipitation KW - DSC KW - TEM KW - excess Si KW - Copper A1 - Belghit, Hanna A1 - Farh, Hichem A1 - Ziar, Toufik A1 - Zidani, Mosbah A1 - Guemini, Meryem PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 63 DA - 2018.12.12 T1 - Study of Mechanical Properties and PrecipitationReactions in Low Copper Containing Al-Mg-Si Alloy SP - 1643 UR - http://journals.pan.pl/dlibra/publication/edition/109129 T2 - Archives of Metallurgy and Materials ER -