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The Hexagonal Close-Packed (HCP) ⇆ Face-Centered Cubic (FCC) Transition in Co-Re-Based Experimental Alloys Investigated by Neutron Scattering

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Abstract

Co-Re-based alloys have been developed to supplement the Ni-base superalloys used in gas turbine applications at high temperatures (1473 K [1200 °C] bare metal temperature). Unlike other commercial Co-based alloys, the Co matrix in the Co-Re alloys has a stable hexagonal close-packed (hcp) structure at room temperature. In situ neutron diffraction measurements on experimental Co-Re alloys hardened by carbide precipitates showed that the matrix undergoes an hcp ⇆ face-centered cubic (fcc) allotropic transformation after heating to high temperatures. Furthermore, it was found that this transformation has a large hysteresis (~100 K). Thermodynamic calculations were undertaken to study the high-temperature phase stability and transformations in the complex multicomponent, multiphase Co-Re-Cr-C system with or without the addition of Ta. The results show that the minor phases (Cr23C6-type carbides and the Cr2Re3-type σ phase) play an important role in the hcp ⇆ fcc hysteresis by influencing the partitioning of Cr and Re between the matrix and the other phases.

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Notes

  1. An isopleth is a phase diagram where the tie lines are not in the plane of the diagram and where at least one extensive variable, normally a composition, is fixed. The isoplethal sections are a special case of the vertical section.

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Acknowledgments

Financial support from the Deutsche Forschungsgemeinschaft for the research project “Beyond Nickelbase Superalloys” is gratefully acknowledged. One author (P. Strunz) acknowledges support from the AV0Z10480505 project and the MPO project FR-TI1/378.

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Authors and Affiliations

  1. TU Braunschweig, Institut für Werkstoffe, 38106, Braunschweig, Germany

    Debashis Mukherji (Senior Scientist) & Joachim Rösler (Professor)

  2. Nuclear Physics Institute ASCR, 25068, Řež near Prague, Czech Republic

    Pavel Strunz (Senior Scientist)

  3. Siemens AG, Energy F PR GT EN, 10553, Berlin, Germany

    Sebastian Piegert (Engineer)

  4. TU München, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), 85747, Garching, Germany

    Ralph Gilles (Senior Scientist), Michael Hofmann (Senior Scientist, Instrument Responsible of Stress-Spec) & Markus Hölzel (Senior Scientist, Instrument Responsible of SPODI)

Authors
  1. Debashis Mukherji
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  2. Pavel Strunz
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  3. Sebastian Piegert
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  4. Ralph Gilles
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  5. Michael Hofmann
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  6. Markus Hölzel
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  7. Joachim Rösler
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Correspondence to Debashis Mukherji.

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Manuscript submitted August 27, 2010.

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Mukherji, D., Strunz, P., Piegert, S. et al. The Hexagonal Close-Packed (HCP) ⇆ Face-Centered Cubic (FCC) Transition in Co-Re-Based Experimental Alloys Investigated by Neutron Scattering. Metall Mater Trans A 43, 1834–1844 (2012). https://doi.org/10.1007/s11661-011-1058-4

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