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Characterization of the microstructure and phase equilibria calculations for the powder metallurgy superalloy IN100

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Abstract

The microstructure of the Ni-based superalloy IN100 processed by a powder metallurgy route was evaluated to reveal the structures, volume fractions, distributions, and chemistries of the various phases present. These data were compared with those predicted by computational thermodynamics. It is shown that the microstructural parameters expected on the basis of global equilibrium conditions differ significantly from those measured experimentally. However, modification of these calculations by use of constrained and successive equilibria compensated for kinetic effects and led to accurate (or better) predictions of phase volume fractions and chemistries in this alloy. This demonstrated that such modified phase equilibria calculations could be powerful tools for modeling microstructures, even in complex multicomponent alloys processed under nonequilibrium conditions.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut, 06269-3136, USA

    Agnieszka M. Wusatowska-Sarnek, Martin J. Blackburn & Mark Aindow

  2. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208-3108, USA

    Gautam Ghosh & Gregory B. Olson

Authors
  1. Agnieszka M. Wusatowska-Sarnek
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  2. Gautam Ghosh
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  3. Gregory B. Olson
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  4. Martin J. Blackburn
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  5. Mark Aindow
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Correspondence to Agnieszka M. Wusatowska-Sarnek.

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Wusatowska-Sarnek, A.M., Ghosh, G., Olson, G.B. et al. Characterization of the microstructure and phase equilibria calculations for the powder metallurgy superalloy IN100. Journal of Materials Research 18, 2653–2663 (2003). https://doi.org/10.1557/JMR.2003.0371

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  • DOI: https://doi.org/10.1557/JMR.2003.0371

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