1. What are the age hardening alloy systems in Al-based alloysbased on classification of major alloyingsystems for Al-basedalloys?
2.In alloy system of Al - 4.4%Cu - 0.8%Si - 0.8%Mn - 0.5%Mgwhich is commonly used for aircraft structures, sketch and explainall transformation stages during age hardening. What is the drivingmechanism for each step?
