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Migration Dynamics of a Σ=3 {112} Boundary in Aluminum

Published online by Cambridge University Press:  21 February 2011

D.L. Medlin ,
W.M. Stobbs ,
J.D. Weinberg ,
J.E. Angelo ,
M.S. Daw  and
M.J. Mills
D.L. Medlin
Affiliation:
Sandia National Laboratories, Livermore, California 94551, USA
W.M. Stobbs
Affiliation:
Department of Materials Science and Metallurgy, Cambridge University, Cambridge, CB2 3QZ, UK
J.D. Weinberg
Affiliation:
University of Arizona, Department of Materials Science and Engineering Tucson, Arizona 85721, USA
J.E. Angelo
Affiliation:
Department of Materials Science and Metallurgy, Cambridge University, Cambridge, CB2 3QZ, UK
M.S. Daw
Affiliation:
Sandia National Laboratories, Livermore, California 94551, USA
M.J. Mills
Affiliation:
Sandia National Laboratories, Livermore, California 94551, USA
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Abstract

We present a study of the structure and migration mechanisms of the Σ=3 {112} boundary in aluminum. Measurements of the static boundary, using both High Resolution Transmission Electron Microscopy (HRTEM) and the α-fringe technique, are consistent with the lowest energy boundary structure that is predicted by the Embedded Atom Method (EAM). HRTEM observations of the migrating boundary are also presented. The boundary is mobile and upon translation produces coherent {111} twin boundary steps. The atomistic processes that are involved in this migration are considered in terms of the required twinning shears and the results of molecular dynamics simulations using the EAM. The initial nucleation of steps in the boundary appears to be electron beam induced.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 273
Copyright
Copyright © Materials Research Society 1994

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