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In-situ TiB_2/AZ31 composites were prepared by utilizing the SHS reaction of Al-Ti-B system in the molten magnesium,and the effects of external physical fields on the dispersion of TiB2 particles were investigated.The results show that high-energy ultrasonic vibration could effectively break up the particle clusters and make the TiB_2 particles uniformly distributed in the melt of TiB_2/AZ31 composites.The compound field(high-energy ultrasonic field coupling with electromagnetic field)could not only distribute the TiB_2 particles into the matrix uniformly,but also make the grains ofα-Mg fine and uniform further than the ultrasonic field solo.The average grain size of as-cast TiB_2/AZ31 composites was reduced from 173μm to 94μm.
In-situ TiB_2 / AZ31 composites were prepared by utilizing the SHS reaction of Al-Ti-B system in the molten magnesium, and the effects of external physical fields on dispersion of TiB2 particles were investigated. The results show that high-energy ultrasonic vibration could effectively break up the particle clusters and make the TiB_2 particles uniformly distributed in the melt of TiB_2 / AZ31 composites. The compound field (high-energy ultrasonic field coupling with electromagnetic field) could not only distribute the TiB_2 particles into the matrix uniformly, but also make the grains of α-Mg fine and uniform further than the ultrasonic field solo. The average grain size of as-cast TiB 2 / AZ31 composites was reduced from 173 μm to 94 μm.