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Microstructure Evolution in a New Refractory High-Entropy Alloy W-Mo-Cr-Ti-Al

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Abstract

The microstructure of a body-centered cubic 20W-20Mo-20Cr-20Ti-20Al alloy in the as-cast condition as well as its microstructural evolution during heat treatment was investigated. Different characterization techniques, such as focused ion beam-scanning electron microscope, X-ray diffraction, and transmission electron microscope, were applied. Experimental observations were supported by thermodynamic calculations. The alloy exhibits a pronounced dendritic microstructure in the as-cast condition with the respective dendritic and interdendritic regions showing significant fluctuations of the element concentrations. Using thermodynamic calculations, it was possible to rationalize the measured element distribution in the dendritic and the interdendritic regions. Observations of the microstructure evolution reveal that during heat treatment, substantial homogenization takes place leading to the formation of a single-phase microstructure. Driving forces for the microstructural evolution were discussed from a thermodynamic point of view.

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Acknowledgment

The financial support by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.

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Authors and Affiliations

  1. Institut für Werkstofftechnik, Universität Siegen, Paul-Bonatz-Str. 9-11, 57068, Siegen, Germany

    Bronislava Gorr (Group Leader of the Research Group “High Temperature Corrosion”), Maria Azim (Ph.D. Student) & Hans-Juergen Christ (Professor)

  2. Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK), Karlsruhe Institute of Technology (KIT), Engelbert-Arnold-Str. 4, 76131, Karlsruhe, Germany

    Hans Chen (Ph.D. Student), Dorothee Vinga Szabo (Senior Researcher), Alexander Kauffmann (Research Associate) & Martin Heilmaier (Professor)

Authors
  1. Bronislava Gorr
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  2. Maria Azim
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  3. Hans-Juergen Christ
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  4. Hans Chen
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  5. Dorothee Vinga Szabo
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  6. Alexander Kauffmann
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  7. Martin Heilmaier
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Correspondence to Bronislava Gorr.

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Manuscript submitted April 23, 2015.

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Gorr, B., Azim, M., Christ, HJ. et al. Microstructure Evolution in a New Refractory High-Entropy Alloy W-Mo-Cr-Ti-Al. Metall Mater Trans A 47, 961–970 (2016). https://doi.org/10.1007/s11661-015-3246-0

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  • DOI: https://doi.org/10.1007/s11661-015-3246-0

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