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Journal of Materials Science
Erschienen in: Journal of Materials Science 4/2019

25.10.2018 | Metals

Effect of U and Th trace additions on the precipitation strengthening of Al–0.09Sc (at.%) alloy

verfasst von: Ofer Beeri, Sung-Il Baik, Avraham I. Bram, Michael Shandalov, David N. Seidman, David C. Dunand

Erschienen in: Journal of Materials Science | Ausgabe 4/2019

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Abstract

The age hardening response of Al–0.09Sc (at.%), to which trace amounts (< 100 ppm) of actinides (An = U or Th) were added, is studied by microhardness, conductivity, transmission electron microscopy, and atom probe tomography (APT). Peak-age hardening at 300 °C is associated with a high number density of nanoscale L12-Al3(Sc1 − xAnx) precipitates with core/shell structure. The first alloy Al–0.09Sc–0.006U (at.%) has a peak microhardness similar to that of binary Al–0.09Sc (at.%), but a shorter incubation period for hardening which is consistent with U diffusing faster than Sc in Al and acting as nucleant for Al3Sc. This is confirmed by APT measurements of precipitate composition, Al3(Sc0.8U0.2), showing that U has high solubility in Al3Sc precipitates and segregates at their core. The second alloy, Al–0.09Sc–0.008Th (at.%), exhibits Th-poor Al3(Sc0.98Th0.02) precipitates with Th segregation in their shells and it has microhardness evolution undistinguishable from binary Al–0.09Sc; this is indicative of low solubility of Th in L12-Al3Sc and/or low diffusivity of Th in Al. These two primordial actinides -U and Th- show different abilities to coprecipitate with Al3Sc precipitate in aluminum, they, however, both improve coarsening resistance after 143 days at 300 °C by forming core/shell structure.
Vorheriger Artikel Influence of the initial state on the microstructure and mechanical properties of AX41 alloy processed by ECAP
Nächster Artikel Intentional and unintentional elemental segregation to grain boundaries in a Ni-rich nanocrystalline alloy

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Metadaten
Titel
Effect of U and Th trace additions on the precipitation strengthening of Al–0.09Sc (at.%) alloy
verfasst von
Ofer Beeri
Sung-Il Baik
Avraham I. Bram
Michael Shandalov
David N. Seidman
David C. Dunand
Publikationsdatum
25.10.2018
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 4/2019
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-3036-3

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