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Krug, M.E.; Werber, A.; Dunand, D.C.; Seidman, D.N. |
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Publication |
Core-shell nanoscale precipitates in Al-0.06 at.% Sc microalloyed with Tb, Ho, Tm or Lu |
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Journal Article |
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2010 |
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Abstract |
Acta Materialia |
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Acta Mater. |
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58 |
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1 |
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Summary Language |
134-145 |
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Rare earth; Precipitation; Microhardness; Atom-probe field-ion microscopy (AP-FIM); Aluminum alloys; Al-Sc |
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Abbreviated Series Title |
The age-hardening response at 300 C of Al-0.06Sc-0.02RE (at.%, with RE = Tb, Ho, Tm or Lu) is found to be similar to that of binary Al-0.08Sc (at.%), except that a shorter incubation period for hardening is observed, which is associated with nanoscale RE-rich Al-3(RE1-xScx) precipitates. In addition, Al-0.06Sc-0.02Tb (at.%) has a much lower peak microhardness than that of Al-0.08Sc (at.%) due to the small solubility of Tb in alpha-Al(Sc). Peak-age hardening occurs after 24 h. and is associated with a high number density of nanoscale Sc-rich Al-3(Sc1-xREx) precipitates. Analysis by three-dimensional local-electrode atom-probe tomography shows that x increases with increasing atomic number, and that the REs partition to the core of the precipitates. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
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Series Issue |
[Krug, Matthew E.; Werber, Alexandra; Dunand, David C.; Seidman, David N.] Northwestern Univ, Evanston, IL 60208 USA, Email: m-krug@northwestern.edu |
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Pergamon-Elsevier Science Ltd |
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1359-6454 |
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ISI:000272405600015 |
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NU @ m-krug @ |
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10807 |
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