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  The role of the base element in γ strengthened cobalt/nickel-base superalloys

Zenk, C. H., Neumeier, S., Kolb, M., Volz, N., Fries, S. G., Dolotko, O. V., et al. (2016). The role of the base element in γ strengthened cobalt/nickel-base superalloys. In Proceedings of the International Symposium on Superalloys (pp. 971-980). Pittsburgh, PA, USA: Minerals, Metals and Materials Society.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-BA1A-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-BA1F-C
Genre: Conference Paper

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 Creators:
Zenk, Christopher H.1, Author              
Neumeier, Steffen1, Author              
Kolb, Markus2, Author              
Volz, N.3, Author              
Fries, Suzana Gomes4, Author              
Dolotko, Oleksandr V.5, Author              
Povstugar, Ivan6, Author              
Raabe, Dierk7, Author              
Göken, Mathias1, Author              
Affiliations:
1Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science and Engineering, Institute i, Martensstr. 5, 91058 Erlangen, Germany, ou_persistent22              
2Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science and Engineering, Institute i, Martensstr. 5, 91058 Erlangen, Germany, persistent22              
3Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science and Engineering, Institute I, Martensstr. 5, Erlangen, Germany, persistent22              
4ICAMS, Ruhr-Universität Bochum, D-44780 Bochum, Germany, ou_persistent22              
5Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universitat Munchen, Lichtenbergstr. 1, Garching, Germany, ou_persistent22              
6Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
7Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Creep; Creep resistance; Hardness; Neutron diffraction; Probes; Superalloys, 3d atom probe tomographies; Atom probe tomography; Co-base superalloys; Intermetallic phasis; Lattice misfits; Partitioning behavior; Polycrystalline models; Solidus temperature, Nickel
 Abstract: Two series of polycrystalline model superalloys - one without and one containing Cr - with varying Ni/Co ratios and otherwise constant element contents were produced and are characterized by a variety of methods. All alloys form a γ/γ′ microstructure after a standard aging treatment at 900 ° C for 100 h. Upon long term aging for 1100 h, the Cr containing Co-base alloy forms undesired intermetallic phases. Liquidus and solidus temperatures are hardly influenced by the Ni/Co content, but the γ′ solvus temperature is strongly decreasing with increasing Co content. Addition of Cr to the alloy series lowers liquidus and solidus, but does not influence the solvus temperature substantially. Neutron diffraction experiments conducted on the Cr containing alloys show that the misfit is negative for alloys rich in Ni, but linearly increases to positive values with increasing Co content. 3D atom probe tomography shows that W preferentially partitions to the γ phase for the Ni-base alloys, whereas it is enriched in γ′ for the Co-base alloys. The partitioning of Co (γ), Cr (γ) and Al (γ′ ) to their respective phases is much more pronounced in Ni rich alloys, i.e. all elements distribute more equally in the Co-base alloys. Nanoindentation on the Cr free alloy variants reveals that the hardness of the Co-base alloy is higher than the one for the Ni-base alloy. However when Cr is present in the alloy, the hardness of the Ni-base alloy is superior. The same behavior is observed in compressive creep experiments at 900 ° C. The addition of Cr strongly improves the creep resistance of the Ni-base alloy, whereas it slightly worsens the performance of the Co-base alloy.

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Language(s): eng - English
 Dates: 2016
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: BibTex Citekey: Zenk2016971
ISBN: 978-111899666-9
 Degree: -

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Title: 13th International Symposium on Superalloys, SUPERALLOYS 2016, Seven Springs Mountain Resort
Place of Event: Seven Springs, PA, USA
Start-/End Date: 2016-09-11 - 2016-09-15

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Title: Proceedings of the International Symposium on Superalloys
Source Genre: Proceedings
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Affiliations:
Publ. Info: Pittsburgh, PA, USA : Minerals, Metals and Materials Society
Pages: - Volume / Issue: 2016 Sequence Number: - Start / End Page: 971 - 980 Identifier: -