Composition Profiles within Al3Li and Al3Sc/Al3Li Nanoscale Precipitates in Aluminum
Autor: | David N. Seidman, David C. Dunand, Matthew E. Krug |
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Jazyk: | angličtina |
Rok vydání: | 2008 |
Předmět: |
Condensed Matter - Materials Science
Materials science Physics and Astronomy (miscellaneous) Precipitation (chemistry) Nanostructured materials Alloy Analytical chemistry chemistry.chemical_element Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences engineering.material chemistry Volume (thermodynamics) Aluminium engineering Composition (visual arts) Nanoscopic scale |
Popis: | An Al-11.3Li-0.11Sc (at. %) alloy was double-aged to induce first alpha'-Al3Sc and then delta'-Al3Li precipitates. Atom-probe tomography revealed both single-phase delta'-precipitates and core-shell alpha'/delta'-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 delta'-shells contain little Sc (~0.027 at. %), the alpha'-cores have a high Li content, with an average composition of Al0.72(Sc0.17 Li0.11). The Li concentrations within the delta'-phase and the Li interfacial excess at the delta'/alpha'-interface both exhibit wide precipitate-to-precipitate variations. 9 pages, 3 figures |
Databáze: | OpenAIRE |
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