Composition profiles within Al3Li and Al3ScAl 3Li nanoscale precipitates in aluminum

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Abstract

An Al-11.3Li-0.11Sc (at. %) alloy was double aged to induce first α′ - Al3 Sc and then δ′ - Al3 Li precipitates. Atom-probe tomography revealed both single-phase δ′ -precipitates and core-shell α′ δ′ -precipitates (with respective average radii of 16 and 27 nm and respective volume fractions of 12% and 9%) conferring a high strength to the alloy. Although the δ′ -shells contain little Sc (∼0.027 at. %), the α′ -cores have a high Li content, with an average composition of Al0.72 (Sc0.17 Li0.11). The Li concentrations within the δ′ -phase and the Li interfacial excess at the δ′ α′ -interface both exhibit wide precipitate-to-precipitate variations.

Original languageEnglish (US)
Article number124107
JournalApplied Physics Letters
Volume92
Issue number12
DOIs
StatePublished - Apr 4 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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