Microstructure of Al3Sc with ternary rare-earth additions

Y. Harada; D. C. Dunand

doi:10.1016/j.intermet.2008.09.002

Microstructure of Al₃Sc with ternary rare-earth additions

Y. Harada^*, D. C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

78 Scopus citations

Abstract

The microstructure of ternary L1₂-Al₃(Sc_1-yRE_y) 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 C11_b-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.

Original language	English (US)
Pages (from-to)	17-24
Number of pages	8
Journal	Intermetallics
Volume	17
Issue number	1-2
DOIs	https://doi.org/10.1016/j.intermet.2008.09.002
State	Published - Jan 2009

Funding

DCD acknowledges the support of the US Department of Energy through grant DE-FG02-98ER45721.

Keywords

A. Rare-earth intermetallics
A. Trialuminides
B. Solid-solution hardening
D. Microstructure
F. Diffraction

ASJC Scopus subject areas

General Chemistry
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.intermet.2008.09.002

Cite this

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title = "Microstructure of Al3Sc with ternary rare-earth additions",

abstract = "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.",

keywords = "A. Rare-earth intermetallics, A. Trialuminides, B. Solid-solution hardening, D. Microstructure, F. Diffraction",

author = "Y. Harada and Dunand, {D. C.}",

note = "Funding Information: DCD acknowledges the support of the US Department of Energy through grant DE-FG02-98ER45721.",

year = "2009",

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doi = "10.1016/j.intermet.2008.09.002",

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AU - Harada, Y.

AU - Dunand, D. C.

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N2 - 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.

AB - 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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KW - F. Diffraction

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