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Harada, Y.; Dunand, D.C. |
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Publication |
Microstructure of Al[sub:3]Sc with ternary rare-earth additions |
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Journal Article |
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2009 |
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Abstract |
Intermetallics |
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17 |
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1-2 |
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17-24 |
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Al-Sc; Trialuminides; Rare-earth intermetallics; Solid-solution hardening; Microstructure; Diffraction |
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Abbreviated Series Title |
The microstructure of ternary L12-Al3(Sc1-yREy) intermetallics, where RE is one of the rare-earth elements selected from five light (La, Ce, Nd, Sm or Eu) or two heavy lanthanoids (Yb or Lu), was investigated as a function of RE concentration for 0.02 <= y <= 0.75. Alloys with light RE show two phases: L12-Al3(Sc,RE) and D019-Al3(RE,Sc) (or C11b-Al4(Eu,Sc)). Alloys with heavy RE exhibit a single L12-Al3(Sc,RE) phase. The maximum RE solubility in the L12 phase is very low (<0.4 at.%) for La, Ce, Nd and Eu, low (3.2 at.%) for Sm and complete solid-solution for Yb and Lu. Both lattice parameter and hardness of the L12-Al3(Sc,RE) phases increase linearly with Sm, Yb or Lu concentration, and the magnitude of both effects correlates with the atomic size mismatch between Sc and RE. |
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NU @ karnesky @ |
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10536 |
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