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The Influence of Oxide Interphases on the Toughness of the Interface Between α‐Al 2 O 3 and Ni(Al) Intermetallic
Author(s) -
Hasegawa Makoto,
Cao Ningyuan,
Kagawa Yutaka,
Rühle Manfred,
Evans Anthony G.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02663.x
Subject(s) - intermetallic , materials science , oxide , fracture toughness , toughness , composite material , metal , diffusion , phase (matter) , metallurgy , chemistry , thermodynamics , physics , organic chemistry , alloy
The effects of a reaction interlayer on the fracture toughness of an interface between α‐Al 2 O 3 and a γ′‐Ni 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, Γ I ≈6 J/m 2 , much lower than that for interfaces between Ni alloys and α‐Al 2 O 3 . Spectra obtained from the fracture surfaces indicate that the oxide‐containing interphases are present on both, consistent with the low toughness.