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Microstructure, Lattice Misfit, and High-Temperature Strength of γ′-Strengthened Co-Al-W-Ge Model Superalloys

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Abstract

The quaternary alloy system Co-Al-W-Ge was investigated and it was found that a continuous \(\gamma /\gamma ^\prime \) two-phase field extends between the systems Co-Al-W and Co-Ge-W. All alloys examined comprised cuboidal L1\(_2\) precipitates coherently embedded in an A1 matrix. Differential scanning calorimetry measurements revealed that the liquidus, solidus, and \(\gamma ^\prime \)-solvus temperatures decrease when the Ge content is increased. The lower liquidus temperature and the capability of \(\gamma ^\prime \)-strengthening in the Ge-rich alloys make them interesting as potential candidates for brazing applications of Co-base superalloys. The \(\gamma /\gamma ^\prime \) lattice misfit was determined by high-resolution X-ray diffraction and found to be positive for all alloys investigated, decreasing with increasing Ge content. The mechanical properties of the Al-rich alloys surpass those rich in Ge.

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Notes

  1. L1\(_2\) and A1 denote crystal structures in Strukturbericht notation

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Acknowledgments

The authors (CHZ, AB, PG, SN, MG) acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through graduate school 1229 and Project B3 of the collaborative research centre SFB/TR 103. One of the authors (HJS) wishes to acknowledge Rolls-Royce plc and EPSRC for funding under the Rolls-Royce plc / EPSRC Strategic Partnership (EP/H500375/1 and EP/M005607/1). The authors would like to acknowledge the Institute of Metals Science and Technology (WTM) at Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) for arc melting the alloys and performing the DSC measurements.

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Authors and Affiliations

  1. Department of Materials Science & Engineering, Institute I, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5, 91058, Erlangen, Germany

    Christopher H. Zenk (Scientific Assistant (PhD Student), Alexander Bauer (Scientific Assistant (PhD Student), Consultant Engineer), Philip Goik (Scientific Assistant (PhD Student), Steffen Neumeier (Senior Scientist, Group Leader) & Mathias Göken (Head of the Institute, Full Professor)

  2. Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Rd, Cambridge, CB3 0FS, UK

    Howard J. Stone (University Lecturer)

  3. Kompetenzzentrum Metall, Metallkunde und Korrosion, TÜV Rheinland LGA Bautechnik GmbH, Tillystr. 2, 90431, Nuremberg, Germany

    Alexander Bauer (Scientific Assistant (PhD Student), Consultant Engineer)

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  1. Christopher H. Zenk
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  2. Alexander Bauer
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Correspondence to Christopher H. Zenk.

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Manuscript submitted July 29, 2015.

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Zenk, C.H., Bauer, A., Goik, P. et al. Microstructure, Lattice Misfit, and High-Temperature Strength of γ′-Strengthened Co-Al-W-Ge Model Superalloys. Metall Mater Trans A 47, 2141–2149 (2016). https://doi.org/10.1007/s11661-016-3408-8

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