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Morphological instability of iron-rich precipitates in Cu-Fe-Co alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Natl Univ Sci & Technol MISiS, Mat Modelling & Dev Lab, Moscow 119049, Russia..ORCID iD: 0000-0002-9920-5393
Univ Rouen Normandy, GPM, CNRS UMR6634, F-76801 St Etienne Du Rouvray, France..
Univ Rouen Normandy, GPM, CNRS UMR6634, F-76801 St Etienne Du Rouvray, France..
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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 163, p. 55-67Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of metallic materials are determined by their microstructure, and in particular, the different morphologies of precipitates lead to distinct strengthening effects. Usually, the shape of precipitates changes during growth and coarsening regimes, leading to modification of the macroscopic properties of the materials. Thus, understanding of this phenomenon is key to tailoring the precipitate strengthening of industrial alloys. In this article, a general approach to explain the shape instability of iron-rich nanoparticles in Cu-Fe-Co alloys during casting and ageing processes is proposed. The evolution of particle shape from sphere to cuboid to petal and finally splitting into eight subnanoparticles is observed using transmission electron microscopy. Phase-field modelling and thermodynamic calculations are combined into a general model that describes and elucidates the morphological evolution of precipitates in alloys in terms of particle size, interfacial and elastic strain energy, and chemical driving force. These findings have the potential to promote new microstructural design approaches for a wide range of materials.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 163, p. 55-67
Keywords [en]
Copper alloys, Precipitation, Morphological stability, Transmission electron microscopy, Phase field modelling
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-239959DOI: 10.1016/j.actamat.2018.10.013ISI: 000451103800005Scopus ID: 2-s2.0-85054834241OAI: oai:DiVA.org:kth-239959DiVA, id: diva2:1269764
Note

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved

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Korzhavyi, Pavel A.

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