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When metal matrix and reinforcement is mixed together

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When metal matrix and reinforcement is mixed together, reinforcement particles can cover the surface of the metal matrix and prevent the contact of metal matrix particles to each other. The indentation of ceramic particles into metal particles caused by the ball milling. So the distribution of ceramic particles in the matrix becomes more uniform, which is necessary for metal matrix composites. In this condition, the maximum metallic surface of particles are covered by the ceramic particles which help better particle connection and material consolidation in later processing stages.
In the experiment.1 (figure.2a) and experiment.2 (figure.2b), the SAC305 and SiC are collected at some points and deformed as a flaky shape i.e. the homogeneous distribution did not show in the experiment.1 (figure.2a) and experiment.2 (figure.2b). Figure.2c shows the mixture of SAC305 and SiC and Figure.2d (experiment.3) shows the homogeneous distribution of SAC305 and SiC particles because all the SiC particles are reached on the surface of SAC305. Fig. 2c shows powders of SAC305 with containing 0.5% silicon particles and it is the mixture of SAC305 metallic particles and SiC particles but in this mixture no interaction between metallic particles and ceramic particles. Fig. 2d is the SEM image of the powders (SAC305 and SiC) mixture of one hour ball milling. It proves that after one hour ball milling, SiC particles are uniformly distributed on the surface of metallic powder particles.

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