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The microstructure of the commercial alloy AA2195 was investigated on thenano-scale after conducting a T8 tempering. This particular thermo-mechanicaltreatment of the specimen resulted in the formation of platelet-shaped $T_{1}$($Al_{2}CuLi$)/ $\theta^{'}$($Al_{2}Cu$) within the Al-matrix. Theelectrochemically prepared samples were analyzed by scanning transmissionelectron microscopy and atom probe tomography for chemical mapping. The$\theta^{'}$ platelets, which are less than 2 nm thick, have the stoichiometriccomposition consistent with the expected ($Al_{2}Cu$) equilibrium composition.Additionally, the Li distribution inside the $\theta^{'}$ platelets was foundto equal the same value as in the matrix. The equally thin $T_{1}$ plateletdeviates from the formula ($Al_{2}Li Cu$) in its stoichiometry and shows Mgenrichment inside the platelet without any indication of a higher segregationlevel at the precipitate/matrix interface. The deviation from the ($Al_{2}LiCu$) stoichiometry cannot be simply interpreted as a consequence of artifactswhen measuring the Cu and Li concentrations inside the $T_{1}$ platelet. Theresults show rather a strong hint for a true lower Li and Cu contents andhence, supporting reasonably the hypothesis that the real chemical compositionfor the thin $T_{1}$ platelet in the T8 tempering condition differs from theequilibrium composition of the thermodynamic stable bulk phase.

Characterization of precipitation in Al-Li alloy AA2195 by means of atom probe tomography and transmission electron microscopy