Abstract
The microdeformation has been investigated under uniaxial compression of beech-derived biocarbons partially graphitized during carbonization in the presence of a Ni- or Fe-containing catalyst. The strength and ultimate fracture strain have been determined at different temperatures of carbonization of the samples in the absence or in the presence of a catalyst. It has been shown using high-precision interferometry that the deformation of biocarbon samples under uniaxial loading occurs through jumps (in magnitude and rate of deformation) with axial displacements in the nanometer and micrometer ranges. The use of a catalyst leads to a decrease in the size of nanometer-scale jumps and in the number of micrometer-scale jumps. The standard deviations of the strain rate on loading steps from the smooth average dependence of the strain rate on the displacement have been calculated for micrometer-scale jumps. A similar characteristic for nanometer- scale jumps has been determined from the distortion of the shape of beats in the primary interferogram. It has been shown that the variation in the standard deviation of the strain rate with a change in the carbonization temperature is similar to the corresponding dependence of the ultimate fracture strain.
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Original Russian Text © V.V. Shpeizman, T.S. Orlova, B.I. Smirnov, A. Gutierrez-Pardo, J. Ramirez-Rico, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 4, pp. 685–691.
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Shpeizman, V.V., Orlova, T.S., Smirnov, B.I. et al. Strength and microplasticity of biocarbons prepared by carbonization in the presence of a catalyst. Phys. Solid State 58, 703–710 (2016). https://doi.org/10.1134/S1063783416040223
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DOI: https://doi.org/10.1134/S1063783416040223