Abstract
TiC and TiB2compounds in the form of interpenetrating network reinforced AZ91D magnesium matrix composites have been successfully synthesized by anin-situreactive infiltration technique. In this process, the ceramic reinforcement phases, TiC and TiB2, were synthesizedin-situfrom elemental powders of Ti and B4C without any addition of a third metal powder such as Al. The molten Mg alloy infiltrates the preform of Tipand B4Cpby the capillary force. The microstructure and reaction mechanism are investigated using SEM/EDS and XRD analysis. The results show that the processing parameters such as temperature, holding time and the green compact relative density have a significant influence on the reaction mechanism and the fabrication of the composite. In addition, the infiltrated Mg acts as an intermediary that makes the reaction possible at a lower temperature than that required for solid-state reaction between Ti and B4C. Microstructural characterization reveals a relatively uniform distribution of the reinforcing phases, TiC and TiB2in the Mg matrix.
Published Version
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