Abstract
A B4[email protected] amorphous carbon (APC)/Al matrix composite was fabricated by using hydrothermal carbonized deposition on chips (HTCDC) process and solid-state synthesis process. The microstructure and mechanical properties of the B4[email protected]/Al matrix composite were investigated. After HTCDC process, nano-B4C particles (50 nm) and micron-sized B4[email protected] core-shell spheres with a diameter of 2 µm were found in the composites. The microhardness of the micron-sized B4[email protected] spheres is 1.66 GPa, which is greater than that of the α-Al matrix (1.06 GPa). Dislocation accumulation is observed around the micron-sized B4[email protected] spheres, indicating that the micron-sized B4[email protected] spheres have a strengthening effect on the α-Al matrix. Due to the formation of micron-sized B4[email protected] spheres, the reinforcement of nano-B4C particles into the composites is transformed from single-sized particle enhancement to bimodal-sized particle enhancement. The strengthening mechanism for B4[email protected]/Al matrix composites with bimodal-sized particles of nano-B4C and micron-sized B4[email protected] spheres were analyzed, which includes thermal mismatch strengthening generated by the mismatch of coefficient of thermal expansion (CTE) between micron-sized B4[email protected] core-shell spheres and α-Al matrix, Orowan strengthening produced by nano-B4C particles, Hall-Petch strengthening and load transfer strengthening produced by the bimodal-sized enhancement from nano and microspheres. A relationship model between the yield strength (YS) increment and the conversion rate (x) of micron-sized B4[email protected] core-shell spheres was estimated.
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