Young's modulus at room temperature and the fracture surface energy, up to 1200°C, were determined for boron carbide specimens with 0 to 15% porosity. Sonic modulus measurements indicated that the Young's modulus decreased as porosity increased in a manner characteristic of the cylindrical pore model. The fracture surface energy appeared to be independent of porosity but was inversely related to temperature. Fractography supported the low values of fracture surface energy that were obtained.
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Hollenberg et al. (1980) studied this question.
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