Load partitioning in Al₂O₃-Al composites with three-dimensional periodic architecture

Interpenetrating composites are created by infiltration of liquid aluminum into three-dimensional (3-D) periodic Al₂O₃ preforms with simple tetragonal symmetry produced by direct-write assembly. Volume-averaged lattice strains in the Al₂O₃ phase of the composite are measured by synchrotron X-ray diffraction for various uniaxial compression stresses up to -350 MPa. Load transfer, found by diffraction to occur from the metal phase to the ceramic phase, is in general agreement with simple rule-of-mixture models and in better agreement with more complex, 3-D finite-element models that account for metal plasticity and details of the geometry of both phases. Spatially resolved diffraction measurements show variations in load transfer at two different positions within the composite.