An Al–11.3Li–0.11Sc (at. %) alloy was double aged to induce first α′-Al3Sc and then δ′-Al3Li precipitates. Atom-probe tomography revealed both single-phase δ′-precipitates and core-shell α′∕δ′-precipitates (with respective average radii of 16 and 27nm and respective volume fractions of 12% and 9%) conferring a high strength to the alloy. Although the δ′-shells contain little Sc (∼0.027at.%), the α′-cores have a high Li content, with an average composition of Al0.72(Sc0.17Li0.11). The Li concentrations within the δ′-phase and the Li interfacial excess at the δ′∕α′-interface both exhibit wide precipitate-to-precipitate variations.
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Krug et al. (2008) studied this question.
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