Escape from the Strength-to-Toughness Paradox: Bulk Ceramics through Dual Composite Architectures
This paper describes an approach to escape from the classic strength-toughness trade-off in bulk ceramics using the dual composite architectural concept. The key questions addressed by the research were: can dual composite architectures be fabricated? -how do dual composite architectures affect the physical properties of ceramics? -do dual composite architectures affect the mechanical behavior of composites? -do dual composite architectures have increased damage tolerance at elevated temperatures? These questions were answered positively. Reinforcing granules dispersed in loose powder mixtures were hot-pressed to obtain fully dense dual composite architectures with target overall composition. Defined sub-composites (labeled granule and matrix) of similar compositions, but differing engineered microstructures, were successfully retained. The brittle-to-ductile transition of MoSi2 above 1400 K enabled the simultaneous increase in both strength and toughness, and values of up to 440 MPa and 11.5 MPa√m, respectively, were experimentally determined at 1773 K.
F. Monteverde et al., "Escape from the Strength-to-Toughness Paradox: Bulk Ceramics through Dual Composite Architectures," Journal of the European Ceramic Society, vol. 38, no. 8, pp. 2961 - 2970, Elsevier Ltd, Jul 2018.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2018.02.003
Materials Science and Engineering
Keywords and Phrases
Dual Composite Architectures; Fracture Toughness; Hot-Pressing; Microstructure-Final; Strength; ZrB2
International Standard Serial Number (ISSN)
Article - Journal
© 2018 Elsevier Ltd, All rights reserved.
01 Jul 2018