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  On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys

Yardley, V. A., Povstugar, I., Choi, P.-P., Raabe, D., Parsa, A. B., Kostka, A., et al. (2016). On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys. Advanced Engineering Materials, 18(9), 1556-1567. doi:10.1002/adem.201600237.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B700-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B701-F
Genre: Journal Article

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 Creators:
Yardley, Victoria A.1, Author              
Povstugar, Ivan2, Author              
Choi, Pyuck-Pa2, 3, Author              
Raabe, Dierk4, Author              
Parsa, Alireza B.5, Author              
Kostka, Aleksander6, Author              
Somsen, Christoph5, Author              
Dlouhý, Antonín7, Author              
Neuking, Klaus5, Author              
George, Easo P.8, Author              
Eggeler, Gunther F.1, Author              
Affiliations:
1Institut für Werkstoffe, Ruhr-Universität Bochum, Bochum, Germany, ou_persistent22              
2Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
3Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea, ou_persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
5Institut für Werkstoffe, Ruhr-Universität Bochum, Universitätstr. 150, Bochum, Germany, ou_persistent22              
6Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, 44801 Bochum, Germany, ou_persistent22              
7Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CZ-Brno, Czech Republic, ou_persistent22              
8Institute for Materials, Ruhr University, Bochum, Germany, persistent22              

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Free keywords: Crystal microstructure; Free energy; Gibbs free energy; Microstructural evolution; Nanoparticles; Phase equilibria; Single crystals; Superalloys; Thermodynamics, Characterization techniques; Chemical compositions; Interdendritic regions; Microstructural features; Single-crystal Ni-base superalloys; Temperature dependencies; Thermodynamic aspects; Thermodynamic calculations, Nickel
 Abstract: High-resolution characterization techniques are combined with thermodynamic calculations (CALPHAD) to rationalize microstructural features of single crystal Ni-base superalloys. Considering the chemical compositions of dendritic and interdendritic regions one can explain differences in γ′-volume fractions. Using thermodynamic calculations one can explain, why γ-nanoparticles are observed in the central regions of large cuboidal γ′-particles and why tertiary γ′-nanoparticles form in the γ-channels. The chemical compositions of the γ-channels and of the newly formed γ-particles differ because of the Gibbs–Thomson pressure which acts on the small particles. With increasing size of secondary γ′-particles, their shape changes from spherical to cuboidal. Some general thermodynamic aspects including the temperature dependencies of the Gibbs free energy G, the enthalpy H, and the entropy S and site occupancies in the ordered L12 (γ′) phase are considered. The importance of cooling rate after homogenization is discussed. © 2016 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim

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Language(s): eng - English
 Dates: 2016-09-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/adem.201600237
BibTex Citekey: Yardley20161556
 Degree: -

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Title: Advanced Engineering Materials
  Abbreviation : Adv. Eng. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : WILEY-VCH Verlag
Pages: - Volume / Issue: 18 (9) Sequence Number: - Start / End Page: 1556 - 1567 Identifier: ISSN: 1438-1656
CoNE: /journals/resource/958634688014