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High Resolution Electron Microscopy of an Alumina/Copper Interface

Published online by Cambridge University Press:  28 February 2011

F. Ernst ,
P. Pirouz  and
A. H. Heuer
F. Ernst
Affiliation:
Dept. of Materials Science and Engineering, Case Western Reserve University Cleveland, OHIO 44106, USA
P. Pirouz
Affiliation:
Dept. of Materials Science and Engineering, Case Western Reserve University Cleveland, OHIO 44106, USA
A. H. Heuer
Affiliation:
Dept. of Materials Science and Engineering, Case Western Reserve University Cleveland, OHIO 44106, USA
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Abstract

Particles of a cubic A12O3 phase in an internally oxidized CuAl alloy were imaged by HREM. These particles are triangular platelets which lie on {111} planes of the copper matrix and have a diameter of about 100nm. They grow by migration of ledges. The platelets are always twinned parallel to their triangular base. At the A12O3 /Cu interface, the lattice of the A12O3 lies either parallel or in twin orientation relationship to the fcc Cu lattice. The interface is always parallel to {111} planes of the A12O3. The lattice parameter of the A12O3 is 10% larger than twice the lattice parameter of Cu. However, HREM micrographs and weak beam micrographs of the A12O3 /Cu interface do not show localized misfit dislocations. HREM image simulations of model structures yielded evidence that the A12O3 particles have a highly disordered spinel type structure. The simulations also indicate that a partly occupied layer of oxygen atoms terminates the A12O3 at the interface with Cu.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 138: Symposium Q – Characterization of the Structure and Chemistry of Defects in Materials , 1988 , 557
Copyright
Copyright © Materials Research Society 1989

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