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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of the American Ceramic Society 2008-11, Vol.91 (11), p.3603-3607
Hauptverfasser: Hasegawa, Makoto, Cao, Ningyuan, Kagawa, Yutaka, Ruehle, Manfred, Evans, Anthony G
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2008.02663.x