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Direct evidence for compressive elastic strain at ground surfaces of nanocomposite ceramics

Tanner, B.K.; Wu, H.Z.; Roberts, S.G.

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Authors

H.Z. Wu

S.G. Roberts



Abstract

High-resolution grazing incidence x-ray powder diffraction has been used to provide direct evidence for the existence of a uniform compressive strain close to the surface of ground alumina/SiC nanocomposites. No such strain is found in ground surfaces of single-phase alumina or polished surfaces of nanocomposite. The strain in the ground nanocomposite is found to be perpendicular to the grinding direction and disappears on annealing at 1250 °C. Such a compressive stress provides a mechanism for enhancing the strength of the nanocomposite, by opposing any tensile loading tending to open surface flaws. The origin of the stresses probably lies in the enhanced grain boundary strength in the nanocomposite alumina–silicon carbide compared to alumina.

Citation

Tanner, B., Wu, H., & Roberts, S. (2005). Direct evidence for compressive elastic strain at ground surfaces of nanocomposite ceramics. Applied Physics Letters, 86(6), https://doi.org/10.1063/1.1862754

Journal Article Type Article
Publication Date Feb 7, 2005
Deposit Date Dec 4, 2006
Publicly Available Date Apr 21, 2011
Journal Applied Physics Letters
Print ISSN 0003-6951
Electronic ISSN 1077-3118
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 86
Issue 6
DOI https://doi.org/10.1063/1.1862754
Keywords Alumina, Silicon compounds, Nanocomposites, Ceramics, Annealing, Grain boundaries, Internal stresses, Micromechanics, Compressive strength, Surface cracks, Grinding, Elasticity, X-ray diffraction.

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Copyright Statement
© 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Tanner, B. K. and Wu, H. Z. and Roberts, S. G. (2005) 'Direct evidence for compressive elastic strain at ground surfaces of nanocomposite ceramics.', Applied physics letters., 86 (6). 061909 and may be found at http://dx.doi.org/10.1063/1.1862754







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