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Study of Dynamic Embrittlement in Alloy Bicrystals

Published online by Cambridge University Press:  10 February 2011

R. G. Muthiah ,
J. A. Pfaendtner ,
C. J. McMahon Jr ,
P. Lejcek  and
V. Paidar
R. G. Muthiah
Affiliation:
University of Pennsylvania, Philadelphia, PA
J. A. Pfaendtner
Affiliation:
University of Pennsylvania, Philadelphia, PA
C. J. McMahon Jr
Affiliation:
University of Pennsylvania, Philadelphia, PA
P. Lejcek
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Prague
V. Paidar
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Prague
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Abstract

In a kinetic model [1] for the phenomenon of dynamic embrittlement, the cracking rate is predicted to be proportional to the diffusivity of the embrittling species along the grain boundary. To test this model, bicrystals of Cu-Sn and Fe-Si with Σ5 symmetrical tilt boundaries are used in which tin and sulfur, respectively, are the embrittling elements. The diffusivities parallel and perpendicular to the tilt axis are expected to be different, therefore the crack growth rates in these two directions should vary in the same ratio as the diffusivities.

Preliminary measurements of crack growth rate along the [100] direction in the Cu-Sn alloy bicrystal are presented. The cracking occurred by decohesion along the grain boundary with almost no observable plasticity. The steady state crack growth was found to be approximately 10∼6 m/sec.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 289
Copyright
Copyright © Materials Research Society 1997

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References

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