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2024 | OriginalPaper | Buchkapitel

Effect of Ce Substitution with La and Nd on Microstructure and Mechanical Properties of Al₁₁Ce₃

verfasst von : Jie Qi, David C. Dunand

Erschienen in: Rare Metal Technology 2024

Verlag: Springer Nature Switzerland

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Abstract

The study investigates the microstructure and mechanical properties of five cast, coarse-grained intermetallic alloys: binary Al₁₁Ce₃ and Al₁₁La₃, ternary Al₁₁(Ce_0.75La_0.25)₃ and Al₁₁(Ce_0.5La_0.5)₃, and quaternary Al₁₁(Ce_0.54La_0.27Nd_0.19)₃ with mischmetal composition. All compounds exhibit a single phase indicating a solid solution among the rare-earth elements (RE = Ce, La, and Nd) on the Ce sublattice of Al₁₁RE₃, contrary to Thermo-Calc prediction of segregation of Ce and (La, Nd) into two insoluble compounds. The orthorhombic Immm-structured α-Al₁₁RE₃ phase’s lattice parameters increase with increasing La concentration, while the α-β phase transformation temperature decreases. The mechanical properties, encompassing high hardness (4.1–4.3 GPa), low indentation fracture toughness (0.48–0.65 MPa m^1/2), together with the high twinning propensity among these five Al₁₁RE₃ compounds are remarkably similar. This similarity suggests that these Al₁₁RE₃ compounds will exhibit comparable strengthening in Al-RE-based eutectic alloys, while also positioning them as economically and environmentally favorable alternatives to the well-developed binary Al₁₁Ce₃ compound formed in current eutectic Al-Ce alloys.

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Titel: Effect of Ce Substitution with La and Nd on Microstructure and Mechanical Properties of Al11Ce3
verfasst von: Jie Qi
David C. Dunand
Verlag: Springer Nature Switzerland
Buch: Rare Metal Technology 2024
Print ISBN: 978-3-031-50235-4

Electronic ISBN: 978-3-031-50236-1

Copyright-Jahr: 2024
DOI: https://doi.org/10.1007/978-3-031-50236-1_39

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