The creep rate of polycrystalline thorium dioxide is reported for 1400° to 1800°C and for 4000, 7500, and 11,000 psi. The microstructure of deformed specimens contained intergranular voids which formed by the apparent growth and coalescence of pores along the grain boundaries. Grain‐boundary sliding also occurred during creep. The strain rate‐stress relation indicates a viscous type of creep process. A mechanism of creep is proposed which involves a diffusional transport of material and which accounts for the appearance of the intergranular voids.
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Poteat et al. (1966) studied this question.
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