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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Microstructural Effects on the Creep Deformation of Alumina/Single-Wall Carbon Nanotubes Composites

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Title
Microstructural Effects on the Creep Deformation of Alumina/Single-Wall Carbon Nanotubes Composites
Author
Zapata-Solvas, EugenioGomez-Garcia, DiegoPoyato, RosaliaLee, ZonghoonCastillo-Rodriguez, MiguelDominguez-Rodriguez, ArturoRadmilovic, VelimirPadture, Nitin P.
Keywords
FINE-GRAINED ALUMINA; COMPRESSIVE CREEP; CERAMICS; TEMPERATURE; BOUNDARIES; AL2O3
Issue Date
201007
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.93, no.7, pp.2042 - 2047
Abstract
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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DOI
http://dx.doi.org/10.1111/j.1551-2916.2010.03681.x
ISSN
0002-7820
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