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In this study, the as-cast microstructure of a high Zn-containing Al-Zn-Mg-Cu- Zr alloy and its evolution during two-stage homogenization were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis. The analysis shows the eutectic structures in as-cast the alloy were identified as α(Al) / Mg(Zn,Cu,Al)2, and also some Al2CuMg, Al2Cu and Fe-rich phases formed in the eutectic structures during solidification. With the prolonging of the second stage homogenization time, S(Al2CuMg), θ(Al2Cu) and Mg(Zn,Cu,Al)2 phases orderly dissolved into the matrix, and the insoluble Fe-rich phases exist in all five as-homogenized schemes in this study, but Zn and Mg elements changes detected in the these particles during the two stage homogenization.

Investigation on As-Cast Microstructure in a high Zn-containing Al-Zn-Mg-Cu-Zr alloy and Its Evolution during Two-stage Homogenization