Journal
ACTA MATERIALIA
Volume 56, Issue 14, Pages 3358-3366Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.03.021
Keywords
toughness; cermets; interface structure; HRTEM; ab-initio electron theory
Funding
- EU [FP6-515784-2]
- Spanish Ministry of Science and Education [MAT2006-10249-C02-01, MAT2006-5122]
- Direccion General de Universidades e Investigacion de la Consejeria de Educacion y Ciencia de la Comunidad de Madrid
- CSIC [200660M042]
- Ministry of Science and Technology
- CSIC
- European Social Fund
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Yttria-stabilized zirconia strengthened with lamellar flaky-shape Nb metal particles was obtained by hot-pressing at 1500 degrees 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. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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