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Interaction of Slip with Grain Boundary in the L12 Ordered Structure - a Σ = 9 Tilt Boundary*

Published online by Cambridge University Press:  26 February 2011

M. H. Yoo  and
A. H. King
M. H. Yoo
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831–6115
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Abstract

The role of slip/grain boundary interaction in intergranular fracture has been analyzed for a Σ = 9 tilt boundary in L12 ordered alloys by use of the anisotropic elasticity theory of dislocations and fracture. Screw superpartials cross slip easily at the boundary onto the (111) and the (001) planes for low and high temperatures, respectively. Transmission of primary slip dislocations onto the conjugate slip system occurs with some difficulty, which is eased by localized disordering. Unless a symmetric double pile-up occurs simultaneously, cleavage fracture is predicted to occur on the (111) plane, not intergranular fracture. Absorption (or emission) of superpartials occurs only when the boundary region is disordered. The inherent weakness of grain boundaries in Ni3AI and its improvement by boron segregation are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 305
Copyright
Copyright © Materials Research Society 1988

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Footnotes

†

Permanent address: Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-2275.

*

Research sponsored by the Division of Materials Sciences, U.S. Department of Energy, under contract DE-ACO5-840R21400 with Martin Marietta Energy Systems, Inc.

References

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