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Modeling of crack tip dislocation emission in B2 intermetallic alloys

Published online by Cambridge University Press:  31 January 2011

Michael F. Bartholomeusz  and
John A. Wert
Michael F. Bartholomeusz
Affiliation:
Department of Materials Science, University of Virginia, Charlottesville, Virginia 22901
John A. Wert
Affiliation:
Department of Materials Science, University of Virginia, Charlottesville, Virginia 22901
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Abstract

A model has been previously proposed to describe the energy associated with emission of dissociated superlattice dislocations from crack tips in ordered intermetallic alloys. In the present paper, the model is applied to several B2 intermetallic alloys. The results of the analysis reveal a correlation between the range of slip system orientations for which emission of a dislocation from a crack tip is energetically favorable and the macroscopic fracture mode of the alloy. Additionally, the effects of changing the active slip system, increasing the thermal energy available for thermally activated dislocation emission, and changing the {111} APB energy on the fracture mode of NiAl and FeAl are discussed.

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Articles
Information
Journal of Materials Research , Volume 7 , Issue 4 , April 1992 , pp. 919 - 925
Copyright
Copyright © Materials Research Society 1992

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