2008/03/09 by Matthew E. Krug, David C. Dunand, David N. Seidman
Engineering · Materials Science · Physics and Astronomy · #Advanced Materials Characterization Techniques #Aluminum Alloy Microstructure Properties #Microstructure and mechanical properties #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.2901150
9 pages, 3 figures
arxiv created 2008/03/09 · openalex publication_date 2008/03/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.