Microstructural Effects on the Creep Deformation of Alumina/Single-Wall Carbon Nanotubes Composites
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- Microstructural Effects on the Creep Deformation of Alumina/Single-Wall Carbon Nanotubes Composites
- Zapata-Solvas, Eugenio; Gomez-Garcia, Diego; Poyato, Rosalia; Lee, Zonghoon; Castillo-Rodriguez, Miguel; Dominguez-Rodriguez, Arturo; Radmilovic, Velimir; Padture, Nitin P.
- FINE-GRAINED ALUMINA; COMPRESSIVE CREEP; CERAMICS; TEMPERATURE; BOUNDARIES; AL2O3
- Issue Date
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.93, no.7, pp.2042 - 2047
- The enhanced high-temperature creep resistance in aluminasingle-wall carbon nanotubes (SWNTs) composites has been attributed to the unprecedented grain-boundary structure of these composites, where the SWNTs bundles segregated at the alumina grain boundaries partially impede grain-boundary sliding. In this study, the effect of SWNTs distributions at alumina grain boundaries on the creep behavior of aluminaSWNTs composites has been investigated. Microstructures of two different alumina10 vol% SWNTs composites, one with heterogeneous and the other with homogenous distributions of SWNTs at grain boundaries, have been characterized quantitatively. The steady-state creep rate (uniaxial compression) in the heterogeneous composite has been found to be over three times higher than that in the homogeneous composite at 1300° and 1350°C (argon atmosphere). It is argued that the less uniform distribution of SWNTs at the alumina grain boundaries in the heterogeneous composite results in less effective obstruction of grain-boundary sliding, and attendant higher creep rate. This also results in more efficient recovery in that composite.
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