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Temperature-Dependent Yourn's Modulus of an SICw/Al2O3 Composite

Published

Author(s)

M Weller, H M. Ledbetter

Abstract

Using a computer-controlled resonant-bar apparatus at frequencies near 5 kHz, we determined the temperature-dependent (86-732 K) Young's modulus of a ceramic-ceramic composite with a 0.30 volume fraction of SiC whiskers in an Al2O3 matrix. Using a megahertz-frequency pulse-echo method, it was verified that the composite shows little anisotropy (variation of the elastic properties with direction). Using a scattered - plane-wave ensemble-average method, we modeled the ambient-temperature elastic constants and found good model-observation agreement. To model the behavior of the Young's modulus with temperature, Varshni's three-parameter relationship for Einstein-oscillator monocrystals was used. Again, good model-observation agreement was found. The mechanical-loss spectrum showed no remarkable features, indicating good whisker-matrix interface properties up to 732 K.
Citation
Journal of Materials Science
Volume
30

Keywords

ceramic composite, composite, elastic constants, low temperatures, Young's modulus

Citation

Weller, M. and Ledbetter, H. (1994), Temperature-Dependent Yourn's Modulus of an SIC<sub>w</sub>/Al<sub>2</sub>O<sub>3</sub> Composite, Journal of Materials Science (Accessed April 16, 2024)
Created February 28, 1994, Updated October 12, 2021