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Thermodynamic Assessment of Cr-Rare Earth Systems

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Abstract

Addition of light rare earth elements in small amounts to refractory metal based alloys (e.g., Cr) can increase both ductility and creep resistance of an alloy because the additives absorb residual oxygen in the alloy by forming oxides that can serve as dispersion strengtheners. In this work, three binary systems, Cr-Ce, Cr-La and Cr-Y, were thermodynamically assessed based on limited experimental data available in the literature using the CALPHAD method. Self-consistent and reasonable thermodynamic descriptions for all three systems were obtained. More importantly, two predictions are made: a peritectic reaction in the La-rich side of Cr-La system and a catatectic reaction in the Y-rich side of Cr-Y system. These predictions and the developed databases are subject to future experiments that are needed to clarify several discrepancies in these binaries.

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Notes

  1. Refractory metals commonly refer to V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Re, Os and Ir.

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Acknowledgments

Financial support for this research was provided by the Advanced Research Program of the NETL’s Strategic Center for Coal through the ORISE program and the RDS contract DE-AC26-04NT41817. The authors thank Paul Jablonski and Paul Mason for helpful discussions.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, 15289, USA

    Wren Chan & Anthony D. Rollett

  2. National Energy Technology Laboratory, 1450 Queen Ave SW, Albany, OR, 97321, USA

    Michael C. Gao, Ömer N. Doğan & Paul King

  3. Parsons, P.O. Box 618, South Park, PA, 15129, USA

    Michael C. Gao

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  1. Wren Chan
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  2. Michael C. Gao
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Correspondence to Michael C. Gao.

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Chan, W., Gao, M.C., Doğan, Ö.N. et al. Thermodynamic Assessment of Cr-Rare Earth Systems. J. Phase Equilib. Diffus. 30, 578–586 (2009). https://doi.org/10.1007/s11669-009-9581-3

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  • DOI: https://doi.org/10.1007/s11669-009-9581-3

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