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Type |
Beeri, Ofer; Dunand, David C.; Seidman, David N. |
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Publication |
Role of Impurities on Precipitation Kinetics of Dilute Al-Sc alloys |
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Journal Article |
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2010 |
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Abstract |
Materials Science and Engineering A |
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527 |
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15 |
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Summary Language |
3501-3509 |
Series Editor  |
Dilute aluminum alloys, Scandium, Precipitation, Impurities, Atom Probe; Al-Sc |
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Abbreviated Series Title |
High purity (HP) aluminum and commercial purity (CP) aluminum (major impurities: ~250
at. ppm Si and ~130 at. ppm Fe) are alloyed with ~250 to ~1100 at. ppm Sc and ~50 at. ppm
RE (RE = La, Ce, Pr, or Nd). The alloys are homogenized at 640 C and aged at 300 C. The
precipitation kinetics, basic mechanical properties, and microstructure are studied using AC
electrical conductivity, microhardness measurements, scanning electron microscopy in
conjunction with energy dispersive x-ray spectroscopy, and atom-probe tomography,
respectively. The Fe and RE elements form micrometer-scale diameter Al~3(Fe,RE) primary
precipitates, which have no effect on the mechanical properties. Silicon accelerates the
precipitation kinetics of nanometer-scale diameter Al3Sc precipitates, increasing their number
density, thereby resulting in a higher microhardness values for CP aluminum than the HP
aluminum having the same Sc concentration. Additionally, the Sc equilibrium solubility in
the -Al matrix is estimated and Orowan's strengthening mechanism is confirmed for the
Al3Sc precipitates. |
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NU @ karnesky @ |
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10742 |
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