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The effect of composition on microstructure both at the length scale of thesecondary dendrite arm spacing and nano-sized dispersoids during homogenizationof Al-Zn-Cu-Mg-Zr alloys has been studied. A comprehensive model that canpredict the microstructure at both the length scales has been used for thestudy. The microstructure predicted has been compared to that for twohomogenized samples from a directionally solidified AA7050 sample and areasonable match has been found. The initial as-cast microstructure fordifferent compositions is calculated using Scheil type solidification fromThermo-Calc. The initial microstructure has a considerable influence onmicrostructural evolution during homogenization. To take advantage of thedecreased solid solubility of Zr in {\alpha}-fcc, cooling rates duringsolidification must be high enough to prevent precipitation of primary Al3Zr.Under solidification with industrial cooling conditions solute rich alloysleads to fewer dispersoids. Based on the study, an improved composition rangeof 6-8%Zn, 1-2%Cu, 1-2%Mg and 0.1-0.15%Zr for 7XXX alloys has been proposed.

Effect of Composition on Microstructural Evolution during Homogenization of 7XXX Alloys