Microstructural and Mechanical Characterisation of Squeeze Cast High Volume Fraction SiCp Reinforced AZ91 Composite

摘要

The increasing demands for civil structural materials of high specific performance have been driving active research on magnesium alloy matrix composites. Ceramic particulate reinforced Mg alloys are commercially attractive to dual-use structural applications due to their high specific mechanical performance, enhanced wear resistance, controllable thermal expansion coefficient and thermal conductivity at both room and elevated temperatures. Although pressurised infiltration of particulate preform on squeeze casting or die casting machine proved to be a promising compositing technique to economically produce near-net shape composite structures in one-shot process, comprehensive investigations on microstructure and properties of particulate Mg composites produced by this technique are very limited, especially those produced by squeeze pressurised liquid metal infiltration.