Stress-induced damage evolution in cast AlSi12CuMgNi alloy with one- and two-ceramic reinforcements

Abstract

Two composites, consisting of an as-cast AlSi12CuMgNi alloy reinforced with 15 vol% Al₂O₃ short fibres and with 7 vol% Al₂O₃ short fibres + 15 vol% SiC particles, were studied. Synchrotron computed tomography disclosed distribution, orientation, and volume fraction of the different phases. In-situ compression tests during neutron diffraction in direction parallel to the fibres plane revealed the load partition between phases. Internal damage (fragmentation) of the Si phase and Al₂O₃ fibres was directly observed in CT reconstructions. Significant debonding between Al matrix and SiC particles was also found. Finally, based on the Maxwell scheme, a micromechanical model was utilized for the new composite with two-ceramic reinforcements; it rationalizes the experimental data and predicts the evolution of all internal stress components in each phase.

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