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Newtonian flow process in polycrystalline silicon carbides: diffusional creep or Harper-Dorn creep?

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Abstract

Some previous studies on hot-pressed and sintered SiC polycrystalline materials have been reexamined. Mechanical data and microstructures strongly suggest that the Newtonian creep behaviour observed in these SiC materials was induced by a dislocation process operating in Harper-Dorn creep, rather than by diffusional creep as concluded before. The supporting evidence for this suggestion includes extensive development of dislocation substructures, no dependence of creep rate upon grain size, and the measured creep rates being far faster than those predicted by the model of diffusion creep, but consistent with those estimated by the model of Harper-Dorn creep.

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  1. Earthquake Research Institute, The University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

    J. N. Wang

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Wang, J.N. Newtonian flow process in polycrystalline silicon carbides: diffusional creep or Harper-Dorn creep?. JOURNAL OF MATERIALS SCIENCE 29, 6139–6146 (1994). https://doi.org/10.1007/BF00354553

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