2026-06-26T16:37:51Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/92122.22024-11-12T15:49:02Zcom_20.500.14352_14col_20.500.14352_15

Pecharromán, Carlos Beltrán Fínez, Juan Ignacio Esteban Betegón, Fátima López-Esteban, Sonia Bartolomé, José F. Muñoz, María del Carmen Moya, José S 2024-02-07T10:20:23Z 2024-01-09T17:42:56Z 2005-05-17 0044-3093 10.3139/146.018128 https://hdl.handle.net/20.500.14352/92122.2 Experimental tests for zirconia/nickel composites determined lower toughness than expected. In this regard, the combination of ab initio density functional theory calculations and high-resolution transmission electron microscopy observations allowed to describe the nature of the zirconia/nickel interface and to justify the absence of any toughening mechanism by grain bridging of the metal particles. In the particular case of nanocomposites, enhanced values of hardness were found. Hardness increases have been justified by a novel model which takes into account the Hall-Petch effect and mean particle size according to the percolation theory. It has been found that this model is not exclusive to zirconia/nickel but can be extended to several other superhard composites. eng restricted access Zirconia/nickel interfaces in micro- and nanocomposites journal article