Keywords:Al-Zn-Mg-Cu alloy;Zn/Mg Ratio;Solution treatment;Second Phase dissolution
Abstract.The main alloying elements have a decisive influence on the type and quantity of thesecond phase of the Al-Zn-Mg-Cu alloy,and even on the dissolution of the second phase duringsolution treatment.The effect of Zn/Mg ratio on second phase dissolution during solution treatmentof Al-Zn-Mg-Cu alloys was investigated by means of differential scanning calorimetry (DSC)，scanning electron microscope (SEM)and electrical conductivity testing.The results showed thatMg(Zn,Cu,Al)2 phase and Fe-rich phase existed in the as-deformed alloys.In addition,a smallamount of Al2CuMg phase was found in the low and medium Zn/Mg ratio alloy.Mg(Zn,Cu,Al)2phase essentially dissolved into the matrix after solution treatment at 465C/2h.Increasing thesolution treatment temperature and time were both beneficial to the dissolution of the Al2CuMgphase.Conductivity is also a method of assessing the level of dissolution of the second phase.Afterthe second phase was fully dissolved in the alloy,the electrical conductivity gradually increasedwith the increase of the solution time.
Construction and Bio-Based Materials Properties and Technologies pdf download
PS:Thank you for your support!
