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Marquis, E. A.; Seidman, D. N. |
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Publication |
Nanoscale Structural Evolution of Al[sub:3]Sc Precipitates in Al(Sc) Alloys |
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Journal Article |
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2001 |
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Abstract |
Acta Materialia |
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Acta Mater. |
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49 |
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11 |
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Summary Language |
1909-1919 |
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aluminum scandium transmission electron microscopy (tem) phase transformations microstructure al-sc alloys creep-properties nucleation scandium aluminum intermetallics kinetics growth energy; Al-Sc |
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Abbreviated Series Title |
Precipitation of the Al3Sc (L12) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al3Sc precipitates were determined for the first time by HREM, in Al–0.1 wt% Sc and Al–0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al3Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time)1/3 kinetic law of Lifshitz–Slyozov–Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening. |
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Series Issue |
Seidman, D. N. Northwestern Univ, Dept Mat Sci & Engn, 2225 N Campus Dr, Evanston, IL 60208 USA Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA |
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