Thermodynamic stabilization of nanocrystalline aluminum

Hohl, Jacob; Kumar, Pankaj; Misra, Mano; Menezes, Pradeep; Mushongera, Leslie T.

doi:10.1007/s10853-021-06224-2

Thermodynamic stabilization of nanocrystalline aluminum

Journal Article · Wed Jun 16 00:00:00 EDT 2021 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-021-06224-2· OSTI ID:2587183

^[1]; Kumar, Pankaj ^[2]; Misra, Mano ^[1]; Menezes, Pradeep ^[1]; Mushongera, Leslie T. ^[1]

University of Nevada, Reno, NV (United States)
University of Nevada, Reno, NV (United States); University of New Mexico, Albuquerque, NM (United States)

Nanocrystalline metals are generally unstable due to a large volume fraction of high-energy grain boundaries associated with a small grain size. Preferential dopant segregation to the high-energy grain boundaries is observed to enhance the stability of the material’s microstructure by minimizing its energy. Nanocrystalline aluminum-dopant systems were evaluated for thermodynamic stability against grain growth and phase precipitation via the mechanism of grain boundary segregation according to a modified regular nanocrystalline solution model. Fifty-one potential dopant elements have been evaluated for their efficacy in stabilizing nanostructures with three potential candidates, magnesium, lanthanum, and silicon, identified possessing the characteristics to promote grain boundary segregation and a state of thermodynamic stability in aluminum’s nanocrystalline regime. Here, the minimum dopant content required to achieve nanocrystalline microstructure stability is identified for each of the three candidate elements. Beyond this minimum content, further addition of the dopant elements decreased the final microstructure’s stability with no effects on the existence of a stable nanocrystalline state.

View Accepted Manuscript (DOE)

Research Organization:: University of Nevada, Reno, NV (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0009116

OSTI ID:: 2587183

Alternate ID(s):: OSTI ID: 1848950
OSTI ID: 2473287

Journal Information:: Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 26 Vol. 56; ISSN 1573-4803; ISSN 0022-2461

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
Dopant
Grain Boundary Stability
Materials Chemistry
Metals and Alloys
Nanocomposites
Nanocrystalline Metals
Nanocrystallography
Nanomaterial
Nanoscale Design
Synthesis and Processing
Thermodynamic Modeling

Thermodynamic stabilization of nanocrystalline aluminum

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