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The Misorientation Dependence of the Fracture Behavior of F.C.C. Metal Bicrystals

Published online by Cambridge University Press:  26 February 2011

Jian-Sheng Wang
Jian-Sheng Wang*
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138, USA
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Abstract

The ductile versus brittle response of Cu bicrystal interfaces with different misorientations and Bi segregation levels has been investigated. The fracture behavior of the bicrystals and the morphology of the fracture surfaces depends on the type of the interface and the amount of impurity segregation. The different fracture behaviors of the bicrystals can to some extent be understood by considering the difference in grain boundary structure and comparing the theoretically predicted values of crack tip energy release rates for dislocation emission from the crack tip versus for cleavage decohesion of the grain boundary. However, the effects of Bi segregation in inducing embrittlement seem greater than can currently be rationalized by such a concept and, also, there is evidence that fracture surfaces may not always coincide, microscopically, with the interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 367
Copyright
Copyright © Materials Research Society 1988

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References

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