Secondary phase increases the elastic modulus of a cast aluminum-cerium alloy

Max L. Neveau; William R. Meier; Hyojin Park; Michael J. Thompson; Nitish Bibhanshu; Catrin Böcher; Tomer Fishman; David Weiss; Matthew F. Chisholm; Orlando Rios; Gerd Duscher

doi:10.1038/s43246-024-00611-3

Secondary phase increases the elastic modulus of a cast aluminum-cerium alloy

Max L. Neveau, William R. Meier, Hyojin Park, Michael J. Thompson, Nitish Bibhanshu, Catrin Böcher, Tomer Fishman, David Weiss, Matthew F. Chisholm, Orlando Rios, Gerd Duscher

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

Abstract

Alloying in metal castings is one of the principal methods of strengthening an alloy for various structural and functional applications, but very rarely does it modify an alloy’s elastic modulus. We report a methodology of combining isostructural Laves phases to form a multi-component, high symmetry, isotropic phase that was discovered to enhance the elastic modulus of a cast aluminum alloy to 91.5 ± 7.4 GPa. Flux grown single crystals of the rhombicuboctahedron phase (RCO), so named for the observed morphology, were used to enhance understanding of the structure and mechanical properties of the phase. The pure RCO phase’s structure and site occupancies were co-refined using x-ray and neutron diffraction. Dynamic nanomechanical testing of the cast alloy shows the primary RCO phase has a high, relatively isotropic, elastic modulus. This RCO containing aluminum alloy is found to have a specific modulus that exceeds that of the leading Al, Mg, Steel, and Ti alloys. (Figure presented.)

Original language	English
Article number	185
Journal	Communications Materials
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s43246-024-00611-3
State	Published - Dec 2024
Externally published	Yes

Funding

We thank Michael Koehler and Andreas Kreyssig for their assistance with structural characterization. Microscopy and XRD instrument access provided by the Microscopy and Diffraction facilities at the Institute for Advanced Materials & Manufacturing (IAMM) at the University of Tennessee, Knoxville. Single crystal growth and structural characterization by WRM is supported by the Gordon and Betty Moore Foundation\u2019s EPiQS Initiative through Grant No. GBMF9069. This research received funding from the DEVCOM Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF2220007. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory of the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. In-situ tensile testing work is based on research conducted at the Center for High-Energy X-ray Sciences (CHEXS), which is supported by the National Science Foundation (BIO, ENG and MPS Directorates) under award DMR-1829070.

Funders	Funder number
Army Research Laboratory of the U.S. Government
University of Tennessee
Gordon and Betty Moore Foundation	GBMF9069
Gordon and Betty Moore Foundation
DEVCOM Army Research Laboratory	W911NF2220007
DEVCOM Army Research Laboratory
National Science Foundation	DMR-1829070
National Science Foundation

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title = "Secondary phase increases the elastic modulus of a cast aluminum-cerium alloy",

abstract = "Alloying in metal castings is one of the principal methods of strengthening an alloy for various structural and functional applications, but very rarely does it modify an alloy{\textquoteright}s elastic modulus. We report a methodology of combining isostructural Laves phases to form a multi-component, high symmetry, isotropic phase that was discovered to enhance the elastic modulus of a cast aluminum alloy to 91.5 ± 7.4 GPa. Flux grown single crystals of the rhombicuboctahedron phase (RCO), so named for the observed morphology, were used to enhance understanding of the structure and mechanical properties of the phase. The pure RCO phase{\textquoteright}s structure and site occupancies were co-refined using x-ray and neutron diffraction. Dynamic nanomechanical testing of the cast alloy shows the primary RCO phase has a high, relatively isotropic, elastic modulus. This RCO containing aluminum alloy is found to have a specific modulus that exceeds that of the leading Al, Mg, Steel, and Ti alloys. (Figure presented.)",

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doi = "10.1038/s43246-024-00611-3",

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AU - Neveau, Max L.

AU - Meier, William R.

AU - Park, Hyojin

AU - Thompson, Michael J.

AU - Bibhanshu, Nitish

AU - Böcher, Catrin

AU - Fishman, Tomer

AU - Weiss, David

AU - Chisholm, Matthew F.

AU - Rios, Orlando

AU - Duscher, Gerd

PY - 2024/12

Y1 - 2024/12

N2 - Alloying in metal castings is one of the principal methods of strengthening an alloy for various structural and functional applications, but very rarely does it modify an alloy’s elastic modulus. We report a methodology of combining isostructural Laves phases to form a multi-component, high symmetry, isotropic phase that was discovered to enhance the elastic modulus of a cast aluminum alloy to 91.5 ± 7.4 GPa. Flux grown single crystals of the rhombicuboctahedron phase (RCO), so named for the observed morphology, were used to enhance understanding of the structure and mechanical properties of the phase. The pure RCO phase’s structure and site occupancies were co-refined using x-ray and neutron diffraction. Dynamic nanomechanical testing of the cast alloy shows the primary RCO phase has a high, relatively isotropic, elastic modulus. This RCO containing aluminum alloy is found to have a specific modulus that exceeds that of the leading Al, Mg, Steel, and Ti alloys. (Figure presented.)

AB - Alloying in metal castings is one of the principal methods of strengthening an alloy for various structural and functional applications, but very rarely does it modify an alloy’s elastic modulus. We report a methodology of combining isostructural Laves phases to form a multi-component, high symmetry, isotropic phase that was discovered to enhance the elastic modulus of a cast aluminum alloy to 91.5 ± 7.4 GPa. Flux grown single crystals of the rhombicuboctahedron phase (RCO), so named for the observed morphology, were used to enhance understanding of the structure and mechanical properties of the phase. The pure RCO phase’s structure and site occupancies were co-refined using x-ray and neutron diffraction. Dynamic nanomechanical testing of the cast alloy shows the primary RCO phase has a high, relatively isotropic, elastic modulus. This RCO containing aluminum alloy is found to have a specific modulus that exceeds that of the leading Al, Mg, Steel, and Ti alloys. (Figure presented.)

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Secondary phase increases the elastic modulus of a cast aluminum-cerium alloy

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