固体润滑国家重点实验室（LSL）知识库

TiAl-based composites reinforced with different high volume fractions of nearly network Ti₂AlC phasehave been successfully prepared by mechanical alloying and hot-pressing method. Their microstructure,mechanical and tribological properties have been investigated. Ti₂AlC network becomes continuous butthe network wall grows thicker with increasing the Ti₂AlC content. The continuity and wall size of thenetwork Ti₂AlC phase exert a significant influence on the mechanical properties. The bending strengthof the composites first increases and then decreases with the Ti₂AlC content. The compressive strengthof the composite decreases slightly compared to the TiAl alloy, but the hardness is enhanced. Due tothe high hardness and load-carrying capacity of the network structure, these composites have the betterwear resistance. And this enhancement is more notable at low applied loads and high Ti2AlC content. Themechanisms simulating the role of network Ti2AlC phase on the wear behavior and the wear process ofTiAl/Ti₂AlC composites at different applied loads have been proposed.