Influence of ceramic-metal interface adhesion on crack growth resistance of ZrO2-Nb ceramic matrix composites

Yttria-stabilized zirconia strengthened with lamellar flaky-shape Nb metal particles was obtained by hot-pressing at 1500 deg C for 1 h. The ZrO2-Nb interface has been studied by atomistic, first-principles calculations and by high-resolution transmission electron microscopy. The influence of the ce...

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Bibliographic Details
Published in:Acta materialia 2008-08, Vol.56 (14), p.3358-3366
Main Authors: BARTOLOME, J. F, BELTRAN, J. I, GUTIERREZ-GONZALEZ, C. F, PECHARROMAN, C, MUNOZ, M. C, MOYA, J. S
Format: Article
Language:English
Subjects:
Applied sciences
Brazing. Soldering
Exact sciences and technology
Fractures
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:Yttria-stabilized zirconia strengthened with lamellar flaky-shape Nb metal particles was obtained by hot-pressing at 1500 deg C for 1 h. The ZrO2-Nb interface has been studied by atomistic, first-principles calculations and by high-resolution transmission electron microscopy. The influence of the ceramic-metal interface on the crack growth resistance has been investigated. Crack growth is shown to occur with a rising resistance, governed by intact metal ligaments in the crack wake. Crack extension occurs by a combination of plastic deformation on the metal particles and interface debonding. The connection between the interface adhesion and this microstructural toughening mechanism has been evaluated.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.03.021