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  First Evidence for Mechanism of Inverse Ripening from In-situ TEM and Phase-Field Study of δ′ Precipitation in an Al–Li Alloy

Park, J., Kamachali, R. D., Kim, S.-D., Kim, S.-H., Oh, C.-S., Schwarze, C., et al. (2019). First Evidence for Mechanism of Inverse Ripening from In-situ TEM and Phase-Field Study of δ′ Precipitation in an Al–Li Alloy. Scientific Reports, 9(1): 3981. doi:10.1038/s41598-019-40685-5.

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First Evidence for Mechanism of Inverse Ripening.pdf (Supplementary material), 6MB
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Park, Jiwon1, Author              
Kamachali, Reza Darvishi2, Author              
Kim, Sung-Dae3, Author              
Kim, Su-Hyeon1, Author              
Oh, Chang-Seok1, Author              
Schwarze, Christian4, Author              
Steinbach, Ingo5, Author              
Affiliations:
1Korea Institute of Materials Science, 797 Changwondaero, Changwon, 51508, Republic of Korea, ou_persistent22              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
3Steel Department, Advanced Metals Division, Korea Institute of Materials Science, 797 Changwondae-ro, Seongsan-gu, Changwon, Gyeongnam, 51508, Republic of Korea, ou_persistent22              
4Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-University Bochum, 44780 Bochum, Germany, ou_persistent22              
5Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, 44780 Bochum, Germany, ou_persistent22              

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 Abstract: In-situ TEM investigation of aging response in an Al–7.8 at. Li was performed at 200 °C up to 13 hours. Semi-spherical δ′ precipitates growing up to an average radius of 7.5 nm were observed. The size and number of individual precipitates were recorded over time and compared to large-scale phase-field simulations without and with a chemo-mechanical coupling effect, that is, concentration dependence of the elastic constants of the matrix solid solution phase. This type of coupling was recently reported in theoretical studies leading to an inverse ripening process where smaller precipitates grew at the expense of larger ones. Considering this chemo-mechanical coupling effect, the temporal evolution of number density, average radius, and size distribution of the precipitates observed in the in-situ experiment were explained. The results indicate that the mechanism of inverse ripening can be active in this case. Formation of dislocations and precipitate-free zones are discussed as possible disturbances to the chemo-mechanical coupling effect and consequent inverse ripening process. © 2019, The Author(s).

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Language(s): eng - English
 Dates: 2019-03-08
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41598-019-40685-5
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 9 (1) Sequence Number: 3981 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322