Abstract
Abstract—The structure of aluminum–lithium 1441 alloy sheets 0.25 mm thick is studied by transmission electron microscopy. The effect of the phases and the phase distributions in the volume, along grain boundaries, and in the precipitation-free zone formed under various artificial aging conditions on the mechanical and corrosion properties of the sheets is analyzed. The main hardening phases in the alloy artificially aged under two and three-stage conditions are found to be δ'(Al3Li) and S'(Al2CuMg). The temperature–time parameters of the aging conditions under study are shown to exert a weak effect on the strength properties of the sheets and a strong effect on the relative elongation and layer corrosion. The corrosion properties mainly depend on the distribution of hardening S- and S'-phase particles and their sizes at grain boundaries and in the grain volume. The artificial aging conditions that ensure the optimum combination of the mechanical and corrosion properties of the grade 1441 alloy are selected.
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