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The Temperature Dependence of Grain Boundary Segregation in B-Doped Ni3Ai Bicrystals

Published online by Cambridge University Press:  01 January 1992

Ursula Otterbein ,
Siegfried Hofmann  and
Manfred Rühle
Ursula Otterbein
Affiliation:
Max-Planck-lnstitut für Metallforschung, Institut für Werkstoffwissenschaft, Seestr. 92, D-7000 Stuttgart 1, Germany.
Siegfried Hofmann
Affiliation:
Max-Planck-lnstitut für Metallforschung, Institut für Werkstoffwissenschaft, Seestr. 92, D-7000 Stuttgart 1, Germany.
Manfred Rühle
Affiliation:
Max-Planck-lnstitut für Metallforschung, Institut für Werkstoffwissenschaft, Seestr. 92, D-7000 Stuttgart 1, Germany.
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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.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 183
Copyright
Copyright © Materials Research Society 1995

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References

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