Abstract
In this paper, in-situ 5 wt% TiB2/A356 composites were fabricated via a salts-metal exothermic reaction process. The effects of CeO2 on the microstructures and mechanical properties of the composites at both as-cast and T6 conditions were investigated. The results showed that the addition of CeO2 could significantly improve the dispersion of TiB2 particles, refine the α-Al grains and modify the coarse lamellar eutectic Si into fine fibrous and granular structures. The optimum addition level for dispersion, refinement and modification was 0.5 wt% CeO2. The values of YS, UTS and El pct of the composite with 0.5% CeO2 in T6 condition were 259 MPa, 307 MPa and 6.4%, which were 14.1%, 8.7% and 39.1% higher than those of the composite without CeO2. The YS enhancement of composite with 0.5 wt% CeO2 was mainly due to the improvement in dispersion of TiB2 particles in the matrix. The improved elongation of composite with 0.5 wt% CeO2 was mainly attributed to the improvement in dispersion of TiB2 particles, the grain refinement, and the modification of eutectic Si phase.
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