Increasing the strength/toughness combination of high volume fraction particulate metal matrixComposites using an Al-Ag matrix alloy

The strength toughness of Particulate reinforced metal matrix composites (PRMMC) containing a high volume fraction of ceramic particles was increased using an Al-Ag matrix alloy. The elevated toughness of these composites was achieved by meeting the initial qualities of the stiff ceramic particles used, which must be free of stress concentration sites and internal defects. The fracture toughness and the tensile strength of these composites could be increased by increasing the matrix flow stress by alloying the aluminum matrix of the composites with copper. The study demonstrates the attractive strength and toughness combinations that can be achieved with appropriately designed volume fraction PRMMC.