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The Structure and Properties of Grain Boundaries in Ni3Al

Published online by Cambridge University Press:  25 February 2011

M. J. Mills ,
S. H. Goods  and
S. M. Foiles
M. J. Mills
Affiliation:
Sandia National Laboratories, Livermore, CA 94551–0969
S. H. Goods
Affiliation:
Sandia National Laboratories, Livermore, CA 94551–0969
S. M. Foiles
Affiliation:
Sandia National Laboratories, Livermore, CA 94551–0969
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Abstract

The mechanical behavior of polycrystalline intermetallic compounds are often strongly influenced by the properties of the interfaces present. A classic example of this is the intergranular fracture exhibited by polycrystalline Ni3Al, and the dramatic increase in ductility upon the addition of small amounts of boron. It has been proposed that boron may promote the transmission of slip across grain boundaries by inducing the formation of a local region of compositional disorder. The results of experimental efforts to characterize the effect of boron on the structure and chemistry of these grain boundaries are summarized. Recent high resolution transmission electron microscopy studies using oriented bicrystals are described which indicate that there is no apparent change in the compositional ordering to within 0.5 nm from the boundary. These experimental results are compared with the results of atomistic calculations which have been used to examine the effect of stoichiometry and boron content on the energy and degree of ordering of these boundaries. The proposed mechanisms of intergranular fracture in Ni3Al are discussed based on this experimental and theoretical work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 127
Copyright
Copyright © Materials Research Society 1992

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