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چکیده
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In this paper, damage evolution of Copper/Titanium Dioxide, fabricated by powder metallurgy, based on Young modulus reduction is investigated. The Cu matrix is reinforced by different volume fraction of TiO2 nano and micro particles using mechanical milling, cold pressing at different loading rates (Quasi-Static, Drop Hammer, Split Hopkinson Bar), and hot extrusion process. The composite tensile test specimens were produced using powder metallurgy (cold pressing) followed by hot extrusion. The effects of the strain rate and the reinforcing particles size on damage evolution of Cu reinforced by 0, 2.5 and 5% volume fractions of nano- and micro-sized TiO2 were investigated. The results showed that the Quasi-Static method was more efficient than the other two methods. In addition, the experimental results showed that strain rate, plastic strain, fracture strain, volume fraction of reinforcement particles and particles aspect ratio were effective on damage evolution. Finally, these effective parameters were incorporated into a new model proposed to predict the damage evolution of Metal Matrix Composite (MMC). The model was validated by experimental results.
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