| Summary: | To synthesize Al composite with high strength at elevated temperature, high modulus and thermal stability, ZrB<sub>2</sub>, Al<sub>3</sub>BC and Al<sub>2</sub>O<sub>3</sub> particles have been chosen as reinforcements simultaneously. A (9.2 wt.% ZrB<sub>2</sub> + 5.6 wt.% Al<sub>3</sub>BC + 5.5 wt.% Al<sub>2</sub>O<sub>3</sub>)/Al composite has been prepared, and the in-situ synthesized particles are nano-sized. Mechanical property tests reveal that the nanoparticles exhibit a remarkable synergistic enhancement effect. The elasticity modulus of the composite is 89 GPa, and the ultimate tensile strengths at 25 °C and 350 °C can be as high as 371 MPa and 154 MPa, respectively.
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