Abstract
The creep of polycrystalline NaCl contaning a fine dispersion of Al2O3 particles is analysed in terms of dependence on stress, temperature, volume fraction and size of dispersion, and grain size of samples. Compressive creep experiments around 0.8 Tm show that the dispersion inhibits diffusive creep. The creep is characterized by a threshold stress above which the creep rate increased linearly with applied stress. The threshold stress decreases with increasing temperature and is proportional to the volume fraction of the dispersion in agreement with a model proposed by Burton. The activation energy corrected for the temperature dependence of the threshold stress falls within a narrow range consistent with grain-boundary diffusion of chlorine in sodium chloride. The grain-size dependence is not consistent with a modified diffusive creep model but it is suggested that it may be controlled by inhibited grain-boundary sliding according to a new model.
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Sinha, R.K., Blachere, J.R. Creep of polycrystalline sodium chloride containing a dispersion of alumina. J Mater Sci 15, 1772–1780 (1980). https://doi.org/10.1007/BF00550597
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DOI: https://doi.org/10.1007/BF00550597