On the atomic structure of the Nb/Al2 O3 interface and the growth of A12 O3 particles

M. Kuwabara; John Spence; M. Ruhle

doi:10.1557/JMR.1989.0972

On the atomic structure of the Nb/Al₂ O₃ interface and the growth of A1₂ O₃ particles

M. Kuwabara, John Spence, M. Ruhle

Physics

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

The growth mechanism for small precipitates of A1₂ O₃ formed by internal oxidation in the Nb-Al₂ O₃ interface is studied in detail. The observations show that the Nb (001)/A1₂ O₃ (00.1) interface is almost atomically flat and that there are no interface compounds. We suggest that the final layer on the A1₂ O₃ side of this interface consists of oxygen atoms. The effects of image forces on misfit dislocations are found to result in a standoff distance between dislocation cores and the interface, in good agreement with the recent theory. The implications of this for the strength of metal-ceramic bonding are discussed.

Original language	English (US)
Pages (from-to)	972-977
Number of pages	6
Journal	Journal of Materials Research
Volume	4
Issue number	4
DOIs	https://doi.org/10.1557/JMR.1989.0972
State	Published - Aug 1989

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/JMR.1989.0972

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title = "On the atomic structure of the Nb/Al2 O3 interface and the growth of A12 O3 particles",

abstract = "The growth mechanism for small precipitates of A12 O3 formed by internal oxidation in the Nb-Al2 O3 interface is studied in detail. The observations show that the Nb (001)/A12 O3 (00.1) interface is almost atomically flat and that there are no interface compounds. We suggest that the final layer on the A12 O3 side of this interface consists of oxygen atoms. The effects of image forces on misfit dislocations are found to result in a standoff distance between dislocation cores and the interface, in good agreement with the recent theory. The implications of this for the strength of metal-ceramic bonding are discussed.",

author = "M. Kuwabara and John Spence and M. Ruhle",

note = "Funding Information: We are grateful to Drs. J. Hirth and A. Heuer for helpful discussions. This work was supported by U.R.I. Award No. N00014-86-K-0753 and the facilities of the ASU/NSF National Center for Electron Microscopy at Arizona State University.",

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AU - Kuwabara, M.

AU - Spence, John

AU - Ruhle, M.

N1 - Funding Information: We are grateful to Drs. J. Hirth and A. Heuer for helpful discussions. This work was supported by U.R.I. Award No. N00014-86-K-0753 and the facilities of the ASU/NSF National Center for Electron Microscopy at Arizona State University.

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N2 - The growth mechanism for small precipitates of A12 O3 formed by internal oxidation in the Nb-Al2 O3 interface is studied in detail. The observations show that the Nb (001)/A12 O3 (00.1) interface is almost atomically flat and that there are no interface compounds. We suggest that the final layer on the A12 O3 side of this interface consists of oxygen atoms. The effects of image forces on misfit dislocations are found to result in a standoff distance between dislocation cores and the interface, in good agreement with the recent theory. The implications of this for the strength of metal-ceramic bonding are discussed.

AB - The growth mechanism for small precipitates of A12 O3 formed by internal oxidation in the Nb-Al2 O3 interface is studied in detail. The observations show that the Nb (001)/A12 O3 (00.1) interface is almost atomically flat and that there are no interface compounds. We suggest that the final layer on the A12 O3 side of this interface consists of oxygen atoms. The effects of image forces on misfit dislocations are found to result in a standoff distance between dislocation cores and the interface, in good agreement with the recent theory. The implications of this for the strength of metal-ceramic bonding are discussed.

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On the atomic structure of the Nb/Al₂ O₃ interface and the growth of A1₂ O₃ particles

Abstract

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