文档介绍：Trans. Nonferrous Met. Soc. China 23(2013) 18751881Precipitation during homogenization cooling in AlMgSi alloysYucel BIROLMaterials Institute, Marmara Research Centre, TUBITAK, Kocaeli 41470, TurkeyReceived 24 August 2012; accepted 23 October 2012Abstract: Precipitation during the industrial cool down takes place predominantly above 300 °C in the EN AW6082 and 6005alloys. The phase precipitation throughout cooling is equilibrium β phase. A considerable capacity is retained after the cool downfor further precipitation during a subsequent heating cycle. The β-Mg2Si is once again the predominant phase that forms during ascan heating cycle employed in exactly the same manner with the industrial billet preheating operation. The precipitation in the 6060alloy, on the other hand, occurs predominantly below 300 °C with additionally β′-Mg2Si particles formed below 200 ° words: aluminium alloys; extrusion; precipitation; homogenization1 IntroductionAluminium extrusions are used in a variety ofstructural applications ranging from building andautomotive to aerospace industries [1]. AlMgSi alloysclaim over a 90% share of the total extruded volumeowing to an bination of mechanicalproperties, corrosion resistance, extrudability and anexcellent response to surface finishing operations [2].The processing of AlMgSi billets always starts witha homogenization cycle since the homogenized bille