L12 ordering and δ′ precipitation in Al-Cu-Li

Handle URI:
http://hdl.handle.net/10754/625059
Title:
L12 ordering and δ′ precipitation in Al-Cu-Li
Authors:
Neibecker, Pascal; Leitner, Michael ( 0000-0002-4975-6787 ) ; Kushaim, Muna; Boll, Torben; Anjum, Dalaver H.; Al-Kassab, Tala’at; Haider, Ferdinand
Abstract:
The precipitation mechanism of the δ' (Al3Li) phase in Al-Li alloys has been controversially discussed in recent decades, specifically with respect to a conjectured congruent ordering process. However, kinetics in the Al-Li system does not allow to resolve the intermediate stages of precipitation and hence to experimentally clarify this issue. In this paper, we are revisiting the subject in ternary Al-Cu-Li alloys with pronouncedly slower kinetics, employing Transmission Electron Microscopy, High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy, Differential Scanning Calorimetry and Atom Probe Tomography. The results show clear evidence for congruent ordering in a selected compositional range, revealing an already strongly L12 ordered microstructure after natural aging with a chemically homogeneous Li distribution and a decomposition of the alloy upon annealing at elevated temperatures. The presented study of the δ' precipitation evaluates the reaction pathway of this process and compares it to the predictions of the Bragg-Williams-Gorsky model with respect to decomposition and ordering in this alloy system.
KAUST Department:
Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Kingdom of Saudi Arabia.
Citation:
Neibecker P, Leitner M, Kushaim M, Boll T, Anjum D, et al. (2017) L12 ordering and δ′ precipitation in Al-Cu-Li. Scientific Reports 7. Available: http://dx.doi.org/10.1038/s41598-017-03203-z.
Publisher:
Springer Nature
Journal:
Scientific Reports
Issue Date:
6-Jun-2017
DOI:
10.1038/s41598-017-03203-z
Type:
Article
ISSN:
2045-2322
Sponsors:
Assistance from Moritz Stolpe and Ralf Busch with alloy preparation is gratefully acknowledged. The study was partially funded through the King Abdullah University of Science and Technology (KAUST) baseline funding program. P.N. acknowledges financial support from the Stiftung Industrieforschung and the Siemens Masters Program. P.N. and M.L. additionally acknowledge support from the German Research Foundation (DFG) via TRR 80 (Augsburg, München, Stuttgart). This work was supported by the German Research Foundation (DFG) and the Technische Universität München within the funding programme Open Access Publishing.
Additional Links:
http://www.nature.com/articles/s41598-017-03203-z
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorNeibecker, Pascalen
dc.contributor.authorLeitner, Michaelen
dc.contributor.authorKushaim, Munaen
dc.contributor.authorBoll, Torbenen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorAl-Kassab, Tala’aten
dc.contributor.authorHaider, Ferdinanden
dc.date.accessioned2017-06-19T09:21:45Z-
dc.date.available2017-06-19T09:21:45Z-
dc.date.issued2017-06-06en
dc.identifier.citationNeibecker P, Leitner M, Kushaim M, Boll T, Anjum D, et al. (2017) L12 ordering and δ′ precipitation in Al-Cu-Li. Scientific Reports 7. Available: http://dx.doi.org/10.1038/s41598-017-03203-z.en
dc.identifier.issn2045-2322en
dc.identifier.doi10.1038/s41598-017-03203-zen
dc.identifier.urihttp://hdl.handle.net/10754/625059-
dc.description.abstractThe precipitation mechanism of the δ' (Al3Li) phase in Al-Li alloys has been controversially discussed in recent decades, specifically with respect to a conjectured congruent ordering process. However, kinetics in the Al-Li system does not allow to resolve the intermediate stages of precipitation and hence to experimentally clarify this issue. In this paper, we are revisiting the subject in ternary Al-Cu-Li alloys with pronouncedly slower kinetics, employing Transmission Electron Microscopy, High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy, Differential Scanning Calorimetry and Atom Probe Tomography. The results show clear evidence for congruent ordering in a selected compositional range, revealing an already strongly L12 ordered microstructure after natural aging with a chemically homogeneous Li distribution and a decomposition of the alloy upon annealing at elevated temperatures. The presented study of the δ' precipitation evaluates the reaction pathway of this process and compares it to the predictions of the Bragg-Williams-Gorsky model with respect to decomposition and ordering in this alloy system.en
dc.description.sponsorshipAssistance from Moritz Stolpe and Ralf Busch with alloy preparation is gratefully acknowledged. The study was partially funded through the King Abdullah University of Science and Technology (KAUST) baseline funding program. P.N. acknowledges financial support from the Stiftung Industrieforschung and the Siemens Masters Program. P.N. and M.L. additionally acknowledge support from the German Research Foundation (DFG) via TRR 80 (Augsburg, München, Stuttgart). This work was supported by the German Research Foundation (DFG) and the Technische Universität München within the funding programme Open Access Publishing.en
dc.publisherSpringer Natureen
dc.relation.urlhttp://www.nature.com/articles/s41598-017-03203-zen
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleL12 ordering and δ′ precipitation in Al-Cu-Lien
dc.typeArticleen
dc.contributor.departmentImaging and Characterization Core Laben
dc.contributor.departmentKing Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Kingdom of Saudi Arabia.en
dc.identifier.journalScientific Reportsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionUniversity of Augsburg, Department of Physics, Universitätsstr. 1, 86159, Augsburg, Germany. pascal.neibecker@frm2.tum.de.en
dc.contributor.institutionUniversity of Augsburg, Department of Physics, Universitätsstr. 1, 86159, Augsburg, Germany.en
dc.contributor.institutionHeinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748, Garching, Germany.en
dc.contributor.institutionTaibah University, Faculty of Science, Department of Physics, PO Box 344, Al-Madinah, Kingdom of Saudi Arabia.en
dc.contributor.institutionKarlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.en
kaust.authorAnjum, Dalaver H.en
kaust.authorAl-Kassab, Tala’aten
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