The Influence of Oxide Interphases on the Toughness of the Interface Between a-Al sub(2)O sub(3) and Ni(Al) Intermetallic
The effects of a reaction interlayer on the fracture toughness of an interface between a-Al sub(2)O sub(3) and a g'-Ni sub(3)Al intermetallic has been assessed. The interfaces have been fabricated by diffusion-bonding, subject to O chemical potentials that result in the formation of a thin (120...
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Veröffentlicht in: | Journal of the American Ceramic Society 2008-11, Vol.91 (11), p.3603-3607 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The effects of a reaction interlayer on the fracture toughness of an interface between a-Al sub(2)O sub(3) and a g'-Ni sub(3)Al intermetallic has been assessed. The interfaces have been fabricated by diffusion-bonding, subject to O chemical potentials that result in the formation of a thin (120 nm) interlayer. High-resolution characterization has revealed that the interlayer consists of mixed oxide-metallic phases, consistent with phase equilibrium for the system. The interface toughness has been measured as, sub(I)-6 J-m super(2), much lower than that for interfaces between Ni alloys and a-Al sub(2)O sub(3). Spectra obtained from the fracture surfaces indicate that the oxide-containing interphases are present on both, consistent with the low toughness. |
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ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/j.1551-2916.2008.02663.x |