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The Temperature Dependence of Grain Boundary Segregation in B-DOPED Ni3AI Bicrystals

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Abstract

Equilibrium grain boundary segregation at symmetrical <110> tilt grain boundaries of Ni3AI bicrystals containing 0.17 at% B and traces of S has been studied by Auger electron spectroscopy and compared directly to surface segregation by applying a special specimen geometry. From the experimentally determined interfacial concentrations after annealing at different temperatures, segregation free energies for B and S at both types of interfaces have been determined using the Langmuir-McLean equation. The effect of B and S segregation on the grain boundary cohesive energy has been calculated.

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Acknowledgements

The authors like to thank Dr. Chuang for the single crystal, D. Korn for the UHV diffusion bonding, Dr. P. Lejček for valuable discussions and the KSB-Stiftung for financial support.

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Authors and Affiliations

  1. Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestr. 92, D-7000, Stuttgart 1, Germany

    Ursula Otterbein, Siegfried Hofmann & Manfred Rühle

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  1. Ursula Otterbein
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  2. Siegfried Hofmann
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  3. Manfred Rühle
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Otterbein, U., Hofmann, S. & Rühle, M. The Temperature Dependence of Grain Boundary Segregation in B-DOPED Ni3AI Bicrystals. MRS Online Proceedings Library 288, 183–188 (1992). https://doi.org/10.1557/PROC-288-183

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  • DOI: https://doi.org/10.1557/PROC-288-183

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