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Effect of ZrO2 inclusions on fracture properties of MgCr204

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Abstract

The effects of unstabilized ZrO2 inclusions on the strength, fracture surface energy and thermal-shock resistance of MgCr2O4 have been evaluated. The fracture surface energy for MgCr2O4-ZrO2 composites was observed to depend on the agglomerate particle size distribution, and volume fraction of the ZrO2 inclusions. Large, nonuniformly distributed ZrO2 inclusions tended to produce a relatively small increase in the fracture surface energy of MgCr2O4. The fracture surface energy increased with increasing ZrO2 content to a maximum value of 24.5J m−2 at 16.5 vol % ZrO2, and decreased as the ZrO2 content increased further. It is proposed that this four-fold increase in fracture surface energy results from the absorption of energy due to microcrack formation in the MgCr2O4 matrix, which results primarily from the tensile stresses due to the tetragonal → monoclinic phase transformation of ZrO2 and the associated volume expansion. The improvement in mechanical properties, specifically the four-fold increase in fracture surface energy, resulted in a substantial increase in thermal-shock resistance of MgCr2O4-ZrO2 composites as indicated by the results of thermal-shock experiments.

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  1. Argonne National Laboratory, Materials and Components Technology Division, 60439, Argonne, Illinois, USA

    J. P. Singh

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  1. J. P. Singh
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Singh, J.P. Effect of ZrO2 inclusions on fracture properties of MgCr204 . J Mater Sci 22, 2685–2690 (1987). https://doi.org/10.1007/BF01086457

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