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Dislocation Reactions at Grain Boundaries in Li2 Ordered Alloys

Published online by Cambridge University Press:  28 February 2011

A.H. King  and
M.H. Yoo
A.H. King
Affiliation:
Department of Materials Science and Engineering, State University of New York, Stony Brook NY 11794-2275.
M.H. Yoo
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6117.
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Abstract

The characteristics of perfect grain boundary dislocations in ordered alloys are discussed, and consideration is given to the possible formation of perfect and imperfect grain boundary dislocations by the impingement of crystal lattice dislocations. It is shown that many dislocation reactions at grain boundaries in ordered alloys are made unfavorableif chemical co—ordination must be maintained in the structure of the grain boundary. This leads to a suggestion that the effect of boron in the grain boundaries of Ni3AI is to reduce the importance of chemical ordering, and thus to promote deformation by allowing greater freedom for dislocation reactions to occur.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 99
Copyright
Copyright © Materials Research Society 1987

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References

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