Effect of the composition of Al-Li alloys on the quantitative relation between the [delta]'(Al^sub 3^Li), S^sub 1^(Al^sub 2^MgLi), and T^sub 1^(Al^sub 2^CuLi) phases

• Published in: Russian metallurgy Metally 2015-01, Vol.2015 (1), p.51
• Main Authors: Betsofen, S Ya, Antipov, V V, Grushin, I A, Knyazev, M I, Khokhlatova, L B, Alekseev, A A
• Format: Article
• Language: English
• ISSN: 0036-0295; 1531-8648
• DOI: 10.1134/S0036029515010024

Al-Li alloys are considered. A quantitative approach to the determination of the ratio of the fractions of the binary and ternary intermetallic phases in Al-Mg(Cu)-Li alloys is developed on the basis of chemical and phase composition balance equations and the experimentally measured lattice parameter of the [alpha] solid solution. The ratio of the fractions of the δ'(Al^sub 3^Li) and S^sub 1^(T^sub 1^) phases in Al-Mg(Cu)-Li alloys is shown to be determined by the ratio of the mole fractions of Li and Mg(Cu). Equations are proposed for calculating the weight fractions of the S^sub 1^(Al^sub 2^MgLi), T^sub 1^(Al^sub 2^CuLi) and δ'(Al^sub 3^Li) phases in domestic and foreign Al-Mg-Li alloys 1420, 1424, 5090 and Al-Cu-Li alloys 1440, 1460, 1461, 1441, 1469, 2090, 2095, 8090, and Weldalite 049.