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Hrtem Observations Of A Σ=3 {112} Bicrystal Boundary In Aluminum

Published online by Cambridge University Press:  15 February 2011

D. L. Medlin ,
M. J. Mills ,
W. M. Stobbs ,
M. S. Daw  and
F. Cosandey
D. L. Medlin
Affiliation:
Sandia National Laboratories, Livermore CA 94551, USA
M. J. Mills
Affiliation:
Sandia National Laboratories, Livermore CA 94551, USA
W. M. Stobbs
Affiliation:
Department of Materials Science and Metallurgy, Cambridge University, Cambridge CB2 3QZ, UK
M. S. Daw
Affiliation:
Sandia National Laboratories, Livermore CA 94551, USA
F. Cosandey
Affiliation:
F. Cosandey, Department of Mechanical and Materials Science, Rutgers University, Piscataway NJ 08854, USA
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Abstract

We present here a study of the Σ=3 {112} incoherent twin boundary in aluminum. Atomistic studies of this boundary indicate that several high energy boundary structures may exist, with the lowest energy structure exhibiting a small rigid body shift parallel to the boundary. The observations presented here indicate that the rigid body shift does in fact occur and that its magnitude, as well as the local grain boundary structure, is well predicted by atomistic calculations using the Embedded Atom Method. The low energy boundary configuration is much narrower than the equivalent boundaries that have been observed in the lower stacking fault energy FCC metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 295: Symposium W – Atomic-Scale Imaging of Surfaces and Interfaces , 1992 , 91
Copyright
Copyright © Materials Research Society 1993

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