Metallurgy at the nanoscale: domain walls in nanoalloys

In binary alloys, domain walls play a central role not only on the phase transitions but also on their physical properties and were at the heart of the 70's metallurgy research. Whereas it can be predicted, with simple physics arguments, that such domain walls cannot exist at the nanometer scale due to the typical lengths of the statistical fluctuations of the order parameter, here we show, with both experimental and numerical approaches how orientational domain walls are formed in CuAu nanoparticles binary model systems. We demonstrate that the formation of domains in larger NPs is driven by elastic strain relaxation which is not needed in smaller NPs where surface effects dominate. Finally, we show how the multivariants NPs tend to form an isotropic material through a continuous model of elasticity.

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ArXiv.org
Published
2025-10-02
Primary Topic
Anodic Oxide Films and Nanostructures
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article
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article

Metallurgy at the nanoscale: domain walls in nanoalloys

Nathaly Ortiz Peña, C. Mottet, Hakim Amara, Jérôme Creuze et al.
ArXiv.org
Anodic Oxide Films and Nanostructures
article

Metallurgy at the nanoscale: domain walls in nanoalloys

Nathaly Ortiz Peña, C. Mottet, Hakim Amara, Jérôme Creuze, Jaysen Nelayah, Grégoire Breyton, Christian Ricolleau, Riccardo Gatti, Adrien Moncomble, Damien Alloyeau, Guillaume Wang
article en

Abstract

In binary alloys, domain walls play a central role not only on the phase transitions but also on their physical properties and were at the heart of the 70's metallurgy research. Whereas it can be predicted, with simple physics arguments, that such domain walls cannot exist at the nanometer scale due to the typical lengths of the statistical fluctuations of the order parameter, here we show, with both experimental and numerical approaches how orientational domain walls are formed in CuAu nanoparticles binary model systems. We demonstrate that the formation of domains in larger NPs is driven by elastic strain relaxation which is not needed in smaller NPs where surface effects dominate. Finally, we show how the multivariants NPs tend to form an isotropic material through a continuous model of elasticity.

ArXiv.org
Centre National de la Recherche Scientifique (FR), Université Paris Cité (FR), Université Paris-Saclay (FR), Office National d'Études et de Recherches Aérospatiales (FR), Laboratoire d'Étude des Microstructures (FR), Laboratoire Matériaux et Phénomènes Quantiques (FR), Institut de Chimie Moléculaire et des Matériaux d'Orsay (FR), Centre Interdisciplinaire de Nanoscience de Marseille (FR)
Agence Nationale de la Recherche
Openalex Percentile: Top 79%
Anodic Oxide Films and Nanostructures
Open Access PDFOpenAlex
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Metallurgy at the nanoscale: domain walls in nanoalloys — Nathaly Ortiz Peña, C. Mottet, et al. · ArXiv.org (2025) | TGRS Research Map | TGRS