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Liquid Metal Penetration along Grain Boundaries

Published online by Cambridge University Press:  15 February 2011

V. E. Fradkov
V. E. Fradkov*
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
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Abstract

Liquid metal grain boundary corrosion is discussed in terms of grain boundary etching profiles with equilibrium dihedral angles at the vertex of the grooves close to zero. It is shown that if the liquid solution is in equilibrium with the solid, then only grain boundary grooving occurs, producing small grooves growing in time as t½. However, if the equilibrium cannot be reached, a long liquid filled canal develops along the grain boundary, rapidly propagating with constant velocity. To stop such rapid grain boundary corrosion certain measures should be taken to reach the equilibrium state. This explains, for example, why removal of oxygen from the Nb(s)-Li(l) system prevents rapid grain boundary corrosion of Nb.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 343: Symposium H – Polycrystalline Thin Films - Structure, Texture, Properties and Applications , 1994 , 247
Copyright
Copyright © Materials Research Society 1994

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References

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