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



M Weller, H M. Ledbetter


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.
Journal of Materials Science


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


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