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Dynamics of Consolidation and Crack Growth in Nanocluster‐Assembled Amorphous Silicon Nitride

Consolidation and fracture dynamics in nanophase amorphous Si{sub 3}N{sub 4} are investigated using 10{sup 6}-atom molecular-dynamics simulations. At a pressure of 15 GPa and 2,000 K, the nanophase system is almost fully consolidated within a fraction of a nanosecond. The consolidation process is well-described by the classical theory of sintering. Under an applied strain the consolidation system develops several cracks which propagate parallel to each other, causing failure at multiple sites. The critical strain at which the nanophase system fractures is much larger than that for crystalline Si{sub 3}N{sub 4}.