Abstract
Aluminum nitride powders were subjected to explosive shock treatment at 17 and 22 GPa and then hot-pressed. The ram pressure required to obtain equivalent densification behavior in hot-pressing was 16 MPa lower in shocked powders than in unshocked powders in the pressure regime in which deformation is attributed to dislocation motion. Transmission electron microscopy on hot-pressed samples confirmed that dislocation processes were active in both shocked and unshocked powders. The higher densification rates in shocked material are related to dynamic recrystallization which is promoted by the high dislocation densities and results in enhanced dislocation motion.
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