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Article

Simulation of the θ′ Precipitation Process with Interfacial Anisotropy Effects in Al-Cu Alloys

1
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2
School of Material Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China
3
Helmholtz-Zentrum Geesthacht GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
4
Institute of Optics and Atomic Physics, Technical University Berlin, 10623 Berlin, Germany
5
Metals and Alloys, University of Bayreuth, Prof.-Rüdiger-Bormann-Straße 1, 95447 Bayreuth, Germany
6
Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Adam Grajcar
Materials 2021, 14(5), 1280; https://doi.org/10.3390/ma14051280
Received: 12 February 2021 / Revised: 1 March 2021 / Accepted: 2 March 2021 / Published: 8 March 2021
The effects of anisotropic interfacial properties and heterogeneous elasticity on the growth and ripening of plate-like θ′-phase (Al2Cu) in Al-1.69 at.% Cu alloy are studied. Multi-phase-field simulations are conducted and discussed in comparison with aging experiments. The precipitate/matrix interface is considered to be anisotropic in terms of its energy and mobility. We find that the additional incorporation of an anisotropic interfacial mobility in conjunction with the elastic anisotropy result in substantially larger aspect ratios of the precipitates closer to the experimental observations. The anisotropy of the interfacial energy shows comparably small effect on the precipitate’s aspect ratio but changes the interface’s shape at the rim. The effect of the chemo-mechanical coupling, i.e., the composition dependence of the elastic constants, is studied as well. We show that the inverse ripening phenomenon, recently evidenced for δ’ precipitates in Al-Li alloys (Park et al. Sci. Rep. 2019, 9, 3981), does not establish for the θ′ precipitates. This is because of the anisotropic stress fields built around the θ′ precipitates, stemming from the precipitate’s shape and the interaction among different variants of the θ′ precipitate, that disturb the chemo-mechanical effects. These results show that the chemo-mechanical effects on the precipitation ripening strongly depend on the degree of sphericity and elastic isotropy of the precipitate and matrix phases. View Full-Text
Keywords: phase-field simulation; interfacial anisotropy; chemo-mechanical coupling; precipitation; elasticity; θ′-(Al2Cu) precipitate phase; aging phase-field simulation; interfacial anisotropy; chemo-mechanical coupling; precipitation; elasticity; θ′-(Al2Cu) precipitate phase; aging
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MDPI and ACS Style

Ta, N.; Bilal, M.U.; Häusler, I.; Saxena, A.; Lin, Y.-Y.; Schleifer, F.; Fleck, M.; Glatzel, U.; Skrotzki, B.; Darvishi Kamachali, R. Simulation of the θ′ Precipitation Process with Interfacial Anisotropy Effects in Al-Cu Alloys. Materials 2021, 14, 1280. https://doi.org/10.3390/ma14051280

AMA Style

Ta N, Bilal MU, Häusler I, Saxena A, Lin Y-Y, Schleifer F, Fleck M, Glatzel U, Skrotzki B, Darvishi Kamachali R. Simulation of the θ′ Precipitation Process with Interfacial Anisotropy Effects in Al-Cu Alloys. Materials. 2021; 14(5):1280. https://doi.org/10.3390/ma14051280

Chicago/Turabian Style

Ta, Na, Muhammad Umer Bilal, Ines Häusler, Alaukik Saxena, Yueh-Yu Lin, Felix Schleifer, Michael Fleck, Uwe Glatzel, Birgit Skrotzki, and Reza Darvishi Kamachali. 2021. "Simulation of the θ′ Precipitation Process with Interfacial Anisotropy Effects in Al-Cu Alloys" Materials 14, no. 5: 1280. https://doi.org/10.3390/ma14051280

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