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Metal-Oxide Interfacial Structures Produced By Internal Oxidation

Published online by Cambridge University Press:  25 February 2011

P. Lu ,
I.-C. Tung  and
F. Cosandey
P. Lu
Affiliation:
Dept. of Mechanics and Materials Science, Rutgers University, Piscataway, NJ 08855.
I.-C. Tung
Affiliation:
Dept. of Mechanics and Materials Science, Rutgers University, Piscataway, NJ 08855.
F. Cosandey
Affiliation:
Dept. of Mechanics and Materials Science, Rutgers University, Piscataway, NJ 08855.
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Abstract

Interfaces in Cu/MgO, Pd/MgO, Pd/Al2O3, Ni/NiAl2O4 and Ni/Al2O3 systems produced by internal oxidation have been studied by transmission electron microscopy. For the Cu/MgO system, the MgO particles, with a cube-on-cube orientation with respect to Cu matrix, are faceted with principal faces parallel to {111} lattice planes of Cu and MgO. For the Pd/MgO system, the MgO particles, with a cube-on-cube orientation with Pd matrix, are faceted with interfaces parallel to the {100} and {111} lattice planes of MgO and Pd. Additional plate-like MgO particles with main facets parallel to {111} lattice planes possess a twin orientation relationship with the Pd matrix. Interfaces in Cu/MgO and Pd/MgO systems are all partially coherent with interfacial misfit dislocations. For the Pd/Al2O3 system, various transition oxide phases such as η, δ, and θ-Al2O3 and stable α-Al2O3 phase have been observed. The [1100] direction of α-Al2O3 is parallel to the [110] direction of Pd and the (0001) plane of α-Al2O3 is parallel or nearly parallel to the (110) plane of Pd. The NiAl2O4 spinel phase and Al2O3 phases are formed in Ni-Al alloys under two different oxidation conditions. The NiAl2O4 particles have a plate-like morphology with a cube-on-cube orientation relationship with the Ni matrix, while Al2O3 particles are randomly oriented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 781
Copyright
Copyright © Materials Research Society 1992

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References

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