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Harada, Yoshihisha; Dunand, David C. |
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Publication |
Microstructure and Hardness of Scandium Trialuminide with Ternary Rare-Earth Additions |
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Journal Article |
Pages |
2007 |
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Abstract |
Materials Science Forum |
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Corporate Author |
Mater. Sci. Forum |
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Publisher |
539-543 |
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Summary Language |
1565-1570 |
Series Editor |
Microstructure, Micro-hardness, Lattice parameter, Al3Sc, Scandium, Rare-earth, SEM/EDS, X-ray diffraction; Al-Sc |
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Abbreviated Series Title |
The microstructure of ternary Al3(Sc1-yREy) intermetallic compounds (where RE is one of
the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE
concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase
containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with
Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the
L12-Al3(Sc1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164),
low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12
solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated
with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the
L12 solid-solution increases linearly with increasing RE concentration. |
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NU @ karnesky @ |
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1833 |
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