Abstract
Micron Ti metal particles were incorporated into SiCp/7075Al composites using pressure infiltration. The interface structure between the Ti metal particles and the matrix during the casting processes were investigated. Results show that the dispersed unreacted Ti particles form mutual diffusion layer at the interface without the formation of low-temperature intermetallic phases during the solidification processes. The interaction between the micron Ti and the molten aluminum alloy is subject to the mutual diffusion coefficient of Ti–Al rather than the reaction activation energy. The tensile strength and plasticity of the composite were improved simultaneously due to the high interfacial bonding strength and released thermal misfit stress cause by the incorporated Ti metal particles.
Highlights
The hard and brittle ceramic particles in the matrix alloy allow the aluminum matrix composites a good combination of high specific strength, high specific modulus and good wear resistance [1]
The analysis corroborates that the mutual diffusion between the Ti metal particle and the molten 7075Al melts is inconspicuous due to their low mutual diffusion coefficient and limited reaction time
It can be deduced that the high interfacial bonding strength of the Ti–Al interface ensures the load effectively transfer to the Ti metal particles during the deformation, leading to an improvement of tensile strength of the AMC-Ti composites
Summary
The hard and brittle ceramic particles in the matrix alloy allow the aluminum matrix composites a good combination of high specific strength, high specific modulus and good wear resistance [1]. S. Marchi found that the contiguity of the reinforcement, due to the reaction between the B4 C and aluminum matrix, increased the composite flow stress, and resulted in a higher rate of particle fracture, significantly influenced the mechanical behaviors of the composite [7]. Marchi found that the contiguity of the reinforcement, due to the reaction between the B4 C and aluminum matrix, increased the composite flow stress, and resulted in a higher rate of particle fracture, significantly influenced the mechanical behaviors of the composite [7] Another way to overcome these adverse effects is to use metal reinforcements [8,9,10]. High interfacial bonding strength can be obtained for the metal the metal reinforcements due to their better wettability with the aluminum matrix alloy [22]. Effects of Tion metal mechanical of the behaviors composites discussed. were discussed
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