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

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.

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.

Item Type:Article
Keywords:Alumina, Silicon compounds, Nanocomposites, Ceramics, Annealing, Grain boundaries, Internal stresses, Micromechanics, Compressive strength, Surface cracks, Grinding, Elasticity, X-ray diffraction.
Full text:PDF - Published Version (895Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.1862754
Publisher statement:Copyright (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. 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://link.aip.org/link/?apl/86/061909
Record Created:04 Dec 2006
Last Modified:21 Apr 2011 13:06

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