Abstract
The processing, microstructures and mechanical properties of intermetallic alloy based on Al–Mo–Zr–Co (AMZC) and its composites reinforced with micro-sized TiC, partially stabilized zirconia (PSZ)-ZrO 2 or SiC particulates were investigated. The results showed that the alloy system exhibits multi-phase microstructures, composed of several aluminides including ZrAl 2, Al 5Co 2, Al 9Co 2, AlMo 3, Al 8Mo 3 and Zr 2Al. The AMZC/SiC composite showed poor mechanical properties, due to the existence of residual porosity and weak interfacial bonding. In contrast, the other two composites exhibited superiority in both flexural strength and fracture toughness at room temperature than the Al–Mo–Zr–Co-based multi-phase alloy. Homogeneous distribution of ceramic particles and perfect interfacial bonding accounted for the improvement of strength. The addition of TiC or ZrO 2 particle into the matrix alloy produced remarkable toughening effect.
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