Abstract
Two sorts of Al-5.6%Zn-2.4%Mg-1.3%Cu alloys with 0.12%Zr and 0.26%Cr, respectively, were hot-rolled by 86% at 400°C and then solution-treated at 470°C. Transmission electron microstructures of both alloys in hot-rolled state are nearly the same. Subgrain structures of both alloys developed after disappearance of the η-particles are quite different. Zr-containing alloy shows an almost perfect subgrain structure, reflecting that the particle size of Al3Zr is much smaller than that of E phase. In Zr-containing alloy, recrystallized grains have naturally appeared faster than in Cr-containing alloy and the grain growth is retained. Elongated grains in the rolling direction are commonly observed in both recrystallized alloys, and are attributed to the layered distribution of Al3Zr or E particles in the rolled sheet.
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