This enhanced densification has been attributed to a repeated generation of mismatch strain between the matrix and the reinforcement phases, in a process similar to that seen in the thermal cycling of fully dense composites. It was postulated that cyclic compression may also reduce density gradients and improve overall uniformity. To test this hypothesis, aluminum and alumina powders were mixed and consolidated under both monotonic and cyclic loading at room temperature. X-ray computed tomography showed that uniformity improved during cyclic compaction. Ceramic particle distributions were found to be more uniform following pressure cycling, especially for compacts having lower aspect ratios.
Cyclic compaction improves overall density and internal uniformity.