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van Dalen, Marsha E.; Karnesky, Richard A.; Cabotaje, Joseph R.; Dunand, David C.; Seidman, David N.
Publication
Erbium and Ytterbium Solubilities and Diffusivities in Aluminum as Determined by Nanoscale Characterization of Precipitates
Volume
Journal Article
Pages
2009
Abstract
Acta Materialia
Corporate Author
Acta Mater.
Publisher
57
Editor
14
Summary Language
4081-4089
Series Editor
Aluminum alloys; Rare-earth elements; Diffusion; Precipitation; Coarsening; Al-Er; Al-Yb
Abbreviated Series Title
Binary aluminum alloys with 0.03-0.06 at.% RE (RE = Yb or Er) were aged to produce coherent, nanosize Al
3
RE precipitates in an α-Al matrix. The temporal evolution of precipitate radii and matrix concentrations at 300 °C are measured by transmission electron microscopy and localelectrode atom-probe tomography, respectively. The temporal dependence of the matrix concentration of each RE is utilized to determine its solubility in Al. The solubility as well as the coarsening rate constants are used to determine the diffusivity of each RE in α-Al and the α-Al/Al
3
RE interfacial free energies at 300 °C. When compared to Sc, both Yb and Er exhibit smaller solubilities but larger diffusivities in α-Al and larger α-Al/Al
3
RE interfacial energies.
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NU @ karnesky @
10598
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