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Atomic Structure of 66° [110] Asymmetric Tilt Grain Boundary in Aluminum

Published online by Cambridge University Press:  10 February 2011

M. Shamsuzzoha ,
P. A. Deymier  and
David J. Smith
M. Shamsuzzoha
Affiliation:
School of Mines and Energy Development, and Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487
P. A. Deymier
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ 85721
David J. Smith
Affiliation:
Center for Solid State Science and Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85827.
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Abstract

A 66° [110] asymmetric tilt grain boundary in Al prepared by cold rolling and annealing has been studied by high-resolution electron microscopy. Due to a 4.5° deviation from the perfect Σ3 misorientation, the boundary is heavily faceted with straight segments running parallel to (111) and (112) planes. All atomic sites across the (111) facets appear to be coincident with the (111) planes at an angle of 66°. The line defects which accommodate the deviation from the perfect twin orientation result in grain boundary stepping. The observed structural features can be described in terms of secondary grain boundary dislocations with Burgers vectors of the type ⅓<111>, and ⅙<112> as well as their interactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 466: Symposium G – Atomic Resolution Microscopy of Surfaces and Interfaces , 1996 , 139
Copyright
Copyright © Materials Research Society 1997

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References

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