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利用超声化学熔体原位反应技术合成了(Al2O3)np/Al复合材料,采用SEM与XRD对复合材料的微观组织和成分进行研究,并通过原位拉伸试验及断裂表面研究分析了该复合材料的断裂行为。结果表明:高能超声产生的局部高压能提供分散团聚纳米颗粒所需的最小压强(约17.2MPa),增强相颗粒数增多,分散较好,Al2O3颗粒在熔体中的形成机制为反应-溶解-析出;该复合材料的抗拉强度及伸长率分别达到116MPa和28.31%,较未施加高能超声作用的复合材料分别提高了52.63%和24.38%;该复合材料的室温拉伸断口表现为韧窝特征,为塑性断裂。
(Al2O3) np / Al composites were synthesized by in situ chemical reaction. The microstructure and composition of the composites were investigated by SEM and XRD. The in-situ tensile tests and fracture surface analysis of the composites Material fracture behavior. The results show that the local pressure generated by high-energy ultrasound can provide the minimum pressure (about 17.2MPa) required to disperse the agglomerated nanoparticles, the number of reinforcing particles increases and the dispersion is better. The formation mechanism of Al2O3 particles in the melt is reaction- The tensile strength and elongation of the composites reached 116MPa and 28.31%, respectively, which were 52.63% and 24.38% higher than that of the composites without high energy ultrasonic. The tensile fracture of the composites showed dimples at room temperature Features, for the plastic fracture.