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Atomic Structure of the Nial Σ=5 (310) Interface

Published online by Cambridge University Press:  01 January 1992

Richard W. Fonda  and
David E. Luzzi
Richard W. Fonda
Affiliation:
Laboratory for Research on the Structure of Matter and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia,, PA 19104-6272
David E. Luzzi
Affiliation:
Laboratory for Research on the Structure of Matter and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia,, PA 19104-6272
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Abstract

The structure of a highly oriented NiAl Σ=5 [001] (310) grain boundary has been imaged by high resolution electron microscopy and analyzed by multislice image calculations. This grain boundary exhibits an asymmetry produced by a rigid body displacement of approximately ½ d130 along the grain boundary, but does not show any measurable expansion of the grain boundary. The match between the simulated and experimental images of this grain boundary is improved by changing the stoichiometry of the boundary, which can be accomplished by adding antisite defects and vacancies. The final model structure incorporates 50% constitutional vacancies on the nickel sites adjacent to the boundary plane and a replacement of the aluminum sites adjacent to the boundary plane with 50% nickel antisite defects and 50% vacancies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 361
Copyright
Copyright © Materials Research Society 1995

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References

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