Transactions of Materials and Heat Treatment

Title：Influence of cold rolling and annealing methods on microstructure of 2××× series aviation aluminium alloy sheet

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2025,50(8):185-197

Abstract：

The influences of cold rolling process and annealing method on the microstructure and grain size of 2024 aviation aluminium alloy sheet were investigated by metallographic microscope and scanning electron microscope. The results indicate that Mn-containing Al7Cu2Fe phase, S phase and a small amount of θ phase are present in 2024 aluminium alloy cold-rolled sheets. After annealing treatment, the types, distribution and morphology of phases in the alloy show little difference compared with those in cold-rolled sheets. After T42 treatment, a large amount of soluble phase in the alloy is dissolved, the area fraction of the second phase decreases rapidly, and the average size of the second phase increases. Complete recrystallization occurs in the cold-rolled sheets after annealing, the recrystallized grains of the double-annealed sheet are significantly smaller than those of the normal-annealed sheet. After normal annealing+T42 treatment, the sheet rolled in two passes has the smallest average grain size. For the sheet treated by double annealing+T42 treatment, the sheet rolled in four passes has the smallest average grain size, with a grain size grade of 9.05. In addition, among the sheets with different reduction amounts, the rolled sheet with the thickness of 0.8 mm has the smallest average grain size after double annealing+T42 treatment, and its grain size grade reaches 9.27.

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作者简介：王永红（1986-），女，硕士，工程师 E-mail：2645138291@qq.com

Reference：

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