Thermal damage of SiC particulate-reinforced aluminum composites (MMCs) caused by laser thermal shock was investigated. The damage was induced by a combination of laser beam thermal shock and mechanical loads. The MMCs have two kinds of particle distributions, one is uniform and another is heterogeneous. The damage initiation, crack propagation, as well as the failure evolution, were observed. A damage parameter was defined and it was tested. One found that the damage mechanism was very different for crack initiation and crack propagation and for MMCs with different spatial particle distributions. The mechanism of MMCs failure is discussed by the ideas of shear stress transfer between matrix and reinforcement. The discussion can explain the distinct mechanism of damage and failure in SiC particulate-reinforced aluminum composites.

Issue Section:
Technical Papers
Keywords:
silicon compounds, ceramics, particle reinforced composites, thermal shock, fracture, aluminium alloys, magnesium alloys, silicon alloys, notch strength, thermal stresses, thermomechanical treatment, laser beam effects
Topics:
Damage, Fracture (Materials), Metal matrix composites, Particulate matter, Stress, Thermal shock, Composite materials, Failure, Laser beams, Crack propagation, Lasers
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