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  Multi-method identification and characterization of the intermetallic surface layers of hot-dip Al-coated steel: FeAl3 or Fe4Al13 and Fe2Al5 or Fe2Al5+x

Van Alboom, A., Lemmens, B., Breitbach, B., De Grave, E., Cottenier, S., & Verbeken, K. (2017). Multi-method identification and characterization of the intermetallic surface layers of hot-dip Al-coated steel: FeAl3 or Fe4Al13 and Fe2Al5 or Fe2Al5+x. Surface and Coatings Technology, 324, 419-428. doi:10.1016/j.surfcoat.2017.05.091.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6486-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6489-4
Genre: Journal Article

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 Creators:
Van Alboom, Antoine1, Author              
Lemmens, Babs2, 3, Author              
Breitbach, Benjamin4, Author              
De Grave, Eddy5, Author              
Cottenier, Stefaan6, 7, Author              
Verbeken, Kim2, Author              
Affiliations:
1Department of Applied Physics, Ghent University, Valentin Vaerwyckweg 1, BE-9000 Gent, Belgium, persistent22              
2Department of Materials, Textiles and Chemical Engineering, Ghent University, Tech Lane Ghent Science Park – Campus A, building 903, BE-9052 Gent, Belgium, persistent22              
3Research group of Electrochemical and Surface Engineering (SURF), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium, persistent22              
4Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
5Department of Physics and Astronomy, Ghent University, Proeftuinstraat 86, BE-9000 Gent, Belgium, persistent22              
6Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, Tech Lane Ghent Science Park – Campus A, building 903, BE-9052 Gent, Belgium, persistent22              
7Center for Molecular Modeling, Ghent University, Tech Lane Ghent Science Park – Campus A, building 903, BE-9052 Gent, Belgium, persistent22              

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Free keywords: MECHANICAL-PROPERTIES; REACTIVE DIFFUSION; SI ALLOY; FE; IRON; ALUMINUM; PHASE; SYSTEM; REFINEMENT; PARAMETERSMaterials Science; Physics; Intermetallics; Density functional theory; Atom probe tomography; Electron backscatter diffraction; Mossbauer spectroscopy; Fe-Al;
 Abstract: Until now, several different chemical formulae are used to refer to the intermetallic theta-and eta-layers formed at the surface of hot-dip aluminized steel. To clear up the subsequent confusion, both layers were identified and characterized using several experimental techniques combined with DFT calculations.(1) EDX- and EBSD-mappings were performed on the cross section of a hot-dip aluminized steel and showed the presence of the two single phased intermetallic layers, theta and eta, just beneath the aluminum top-layer. The XRD-pattern of a sample of which the top aluminum layer was removed, confirmed the foregoing observations. The compositions of both layers were determined by APT and yield Fe4Al13 and Fe2Al5.6. DFT calculations showed the stability of the Fe4Al13 phase and predicted Fe4Al13 to be the only stable composition in that area of the Fe-Al phase diagram. Based on the DFT results, the ILEEMS spectrum of the theta-layer could be successfully analyzed and, for the first time, fully interpreted in accordance with the crystallographic structure of Fe4Al13. Fe4Al13 is suggested for referring to the composition of the theta-layer, instead of other formulae, e.g. FeAl3. The ILEEMSThlayer spectrum was best reproduced by a model-independent quadrupole splitting distribution, which supports the dis-ordered structure model for the eta-layer. An analysis based on the results of the DFT calculations, confirmed this finding. Because of the partially dis-ordered structure of the eta-layer and the width of the related region in Fe-Al phase diagrams, Fe2Al5-x is suggested for referring to the composition of the eta-layer. (C) 2017 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2017-09-15
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Degree: -

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Title: Surface and Coatings Technology
  Abbreviation : Surf. Coat. Tech.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Lausanne : Elsevier
Pages: - Volume / Issue: 324 Sequence Number: - Start / End Page: 419 - 428 Identifier: ISSN: 0257-8972
CoNE: /journals/resource/954925496044