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Ductile deformation in alumina/silicon carbide nanocomposites
journal contribution
posted on 2009-12-08, 15:11 authored by Houzheng Wu, Steve G. Roberts, Brian DerbyA transmission electron microscope study on cross sections obtained from ground and polished
surfaces has revealed that ductile deformation is dominated by dislocations in alumina/silicon carbide
nanocomposites containing 1, 5 and 10 vol% silicon carbide particles, and by twinning in unreinforced
alumina. The dispersed silicon carbide particles in alumina/silicon carbide nanocomposites restrict the
motion of dislocations. A dislocation pinning model is used to compare the possible mechanisms of
deformation in alumina and the nanocomposites. Cr-fluorescence piezospectroscopy has been used to
characterise the residual stress levels in the materials studied. The measured broadening of the
Al2O3/Cr3+ fluorescence peak indicates a dislocation density of 7.3 - 9.7 x 1016 m-2 under the
indentations in the nanocomposites, whilst the beneath indentations in alumina is 1-2 orders of
magnitude smaller.
History
School
- Science
Department
- Computer Science
Citation
WU, H, ROBERTS, S. and DERBY, B., 2009. Ductile deformation in alumina/silicon carbide nanocomposites. 33rd International Conference and Exposition on Advanced Ceramics and Composites, January 18th-23rd 2009, Daytona Beach, Florida.Publisher
© The American Ceramic SocietyVersion
- AM (Accepted Manuscript)
Publication date
2009Notes
This conference paper was presented at the 33rd International Conference and Exposition on Advanced Ceramics and Composites (ICACC): http://ceramics.org/meetings/meetings-archives/icacc09-archive/Language
- en