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Research Article | Open Access

Prediction of tensile power law creep constants from compression and bend data for ZrB2-20 vol% SiC composites at 1800 °C

Ali KHADIMALLAH( )Marc W. BIRDKenneth W. WHITE
Department of Mechanical Engineering, University of Houston, Houston, TX, USA
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Abstract

Here we consider our four-point flexure and compression creep results obtained under Ar protection at 1800 ℃ to predict the tensile creep behavior of a ZrB2-20 vol% SiC ultra-high temperature ceramic. Assuming power law creep, and based on four-point bend data, we estimated the uniaxial creep parameters using an analytical method present in the literature. Both predicted and experimental compressive stress exponents were found to be in excellent agreement, 1.85 and 1.76 respectively, while observation of the microstructure suggested a combination of diffusion and grain boundary sliding creep mechanisms in compression. Along with the microstructural evidence associated with the tensile regions of the flexure specimens, the predicted tensile stress exponent of 2.61 exceeds the measured flexural value of 2.2. We assert an increasing role of cavitation to the creep strain in pure tension. This cavitation component adds to the dominant grain boundary sliding mechanism as described below and elsewhere for flexural creep.

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Journal of Advanced Ceramics
Pages 304-311
Cite this article:
KHADIMALLAH A, BIRD MW, WHITE KW. Prediction of tensile power law creep constants from compression and bend data for ZrB2-20 vol% SiC composites at 1800 °C. Journal of Advanced Ceramics, 2017, 6(4): 304-311. https://doi.org/10.1007/s40145-017-0242-4

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Received: 12 January 2017
Revised: 31 July 2017
Accepted: 22 August 2017
Published: 19 December 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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