Abstract
AA 5052 aluminum alloy tube billets were prepared by HCCM vertical continuous casting to study the effect of homogenization temperature and time on the second phases and mechanical properties. The volume fraction of constituent, length of constituent colonies, number density and volume fraction of dispersoids were examined in different homogenization conditions. Optimized homogenization can be obtained at 560 °C for 20 h, and the elongation of the HCCM continuous casting billet increases from 25.5% (as-cast) to 35.5%, while that of the semicontinuous casting billets only increases from 21.5% (as-cast) to 23.5%. In particular, fine and interlaced Mg2Si and Al6(Fe,Mn) phases are obtained after HCCM continuous casting, which is different from the separated distribution phases after traditional semicontinuous casting and improves the effectiveness of homogenization treatment.
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