Abstract
Abstract The thermal fatigue behavior of Al–Si/SiC p (15 vol.% SiC particulate) composite synthesized by multi-layer spray-deposition was studied for the crack initiation and propagation characteristics. Specimens containing a V-shaped notch were found to commence crack initiation at the notch tip. Samples with high micro-hardness and low porosity volume fraction show superior thermal fatigue resistance. Crack propagation rate and micro-hardness exhibit quasi-periodic up-and-down variation, while exhibiting an opposite variation, i.e. every increase of crack propagation speed corresponds to a decrease of micro-hardness. Crack propagating through the Si particles and around Si particles are observed. The cracking of SiC particles and the debonding of reinforcement/matrix are proven to be the main mechanism when the crack-tip interacts with SiC particles.
Published Version
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