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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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