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The dynamic properties of monolithic ceramics are in general degraded by the presence of a second phase. Impedance mismatch is the primary factor responsible for microstructural damage in the region of the phase boundaries. Planar shock recovery experiments have shown that microcracks in alumina/glass are generally initiated at a stress level below the observed dynamic failure stress. The initial microcracks are unconnected and the sample retains elastic rigidity, in spite of the loss of spall strength associated with the microstructural damage. Microcracking results in local residual stress concentrations and local heating which accompany the elastic energy release. Dislocation multiplication and glide, the flow and redistribution of any glassy phase, and partial crystallisation of the glass are among the possible consequences of this local heating

THE DYNAMIC PROPERTIES OF TWO-PHASE ALUMINA/GLASS CERAMICS