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  Simulation of the θ’ precipitation process with interfacial anisotropy effects in Al–Cu alloys

Ta, N., Bilal, M. U., Häusler, I., Saxena, A., Lin, Y.-Y., Schleifer, F., et al. (2021). Simulation of the θ’ precipitation process with interfacial anisotropy effects in Al–Cu alloys. Materials, 14(5): 1280. doi:10.3390/ma14051280.

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materials-14-01280-v2-1.pdf (Publisher version), 42MB
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 Creators:
Ta, Na1, 2, Author           
Bilal, Muhammad Umer3, Author
Häusler, Ines4, Author
Saxena, Alaukik5, Author           
Lin, Yueh-Yu6, Author
Schleifer, Felix6, Author
Fleck, Michael6, Author
Glatzel, Uwe6, Author
Skrotzki, Birgit7, Author
Kamachali, Reza Darvishi1, 8, Author           
Affiliations:
1Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
2School of Material Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China, ou_persistent22              
3Helmholtz-Zentrum Geesthacht GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany, ou_persistent22              
4Institute of Optics and Atomic Physics, Technical University Berlin, 10623 Berlin, Germany, ou_persistent22              
5Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863337              
6Metals and Alloys, University of Bayreuth, Prof.-Rüdiger-Bormann-Straße 1, 95447 Bayreuth, Germany, ou_persistent22              
7Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany, ou_persistent22              
8Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205, Berlin, Germany, ou_persistent22              

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Free keywords: Anisotropy; Aspect ratio; Binary alloys; Copper alloys; Inverse problems; Lithium alloys; Precipitation (chemical), Anisotropic stress field; Chemo-mechanical couplings; Composition dependence; Elastic anisotropy; Interfacial mobility; Interfacial property; Multi-phase field simulations; Precipitation process, Aluminum alloys
 Abstract: 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 precipi-tate/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 precip-itate’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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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Language(s): eng - English
 Dates: 2021-03-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3390/ma14051280
 Degree: -

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Title: Materials
  Abbreviation : Materials
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: 19 Volume / Issue: 14 (5) Sequence Number: 1280 Start / End Page: - Identifier: ISSN: 1996-1944
CoNE: https://pure.mpg.de/cone/journals/resource/1996-1944