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Thermodynamic and Microstructural Modeling of Nb-Si Based Alloys

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  • Hume-Rothery Symposium
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Nb-Si alloys have gained much attention over the last decade as the next generation alloys for high-temperature aero-engine applications due to their low density and improved mechanical properties. However, the microstructures of these alloys are quite complex and vary significantly with the addition of elements such as Ti and Hf. Hence, an improved understanding of the phase stability and the microstructural evolution of these alloys is essential for alloy design for advanced high-temperature applications. In the present paper, we describe the microstructural evolution modeling results of the dendritic and eutectic solidification of the binary Nb-16 at.% Si alloy, obtained using a Phase-Field simulations performed with MICRESS. The effect of parameters; such as heat extraction rate, the ratio of the diffusivity of the solute in liquid to solid, and the interfacial energy of liquid and solid interface, on the microstructural evolution during dendritic solidification is discussed in detail.

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Acknowledgments

The authors acknowledge Christine Furstoss and Craig Young for providing their valuable suggestions on the project, Dr. Bernd Böttger and Philippe Schaffnit for their advise on the technical details associated with implementation of MICRESS software.

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Authors and Affiliations

  1. GE Global Research, Bangalore, 560066, India

    Sundar Amancherla & Sujoy Kar

  2. GE Global Research, Niskayuna, NY, 12309, USA

    Bernard Bewlay

  3. Department of Materials Science & Engineering, University of Wisconsin, Madison, WI, 53706, USA

    Yang Ying & Austin Chang

Authors
  1. Sundar Amancherla
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  2. Sujoy Kar
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  3. Bernard Bewlay
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  4. Yang Ying
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Correspondence to Sundar Amancherla.

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Amancherla, S., Kar, S., Bewlay, B. et al. Thermodynamic and Microstructural Modeling of Nb-Si Based Alloys. J Phs Eqil and Diff 28, 2–8 (2007). https://doi.org/10.1007/s11669-006-9015-4

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  • DOI: https://doi.org/10.1007/s11669-006-9015-4

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