Plastic relaxation of thermoelastic stress in aluminum/ceramic composites |
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Authors: | C T Kim J K Lee M R Plichta |
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Affiliation: | (1) Department of Metallurgical Engineering, Michigan Technological University, 49931 Houghton, MI |
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Abstract: | The dislocation generation due to a thermoelastic stress in 2024 Al/ceramic (SiC or TiC) composites was studied using transmission
electron microscopy Composites containing different ceramic particulates, ceramic volume fraction, and particle size were
investigated. Dislocation density profiles were measured as a function of the distance from an Al/ceramic interface and compared
with those calculated from an elastoplasticity model which accounts for the volume fraction of the ceramic particles. The
intensity of dislocation generation showed a strong particle size dependence: as the ceramic particle size became of the order
of a micron, the intensity of dislocation generation increased significantly. With an increase in the volume fraction of the
ceramic particles, the dislocation density also increased, and the dislocation structure became a more tangled arrangement.
If heat dissipation was taken into account as part of the plastic work, the predicted dislocation densities of the elastoplasticity
model were found to be in reasonable agreement with the measured dislocation densities of 109 to 1010 cm−2. |
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