In this study, aluminum A356 (AlSi7Mg0.3) alloy matrix composites reinforced with various fractions (0.5, 1.0 and 1.5 wt%) of Al₂O₃ particles having two different particle sizes (nano- and micro-size) were produced, and the effect on mechanical properties of aluminum metal matrix composite was examined. Ultrasonic-assisted mechanical stirring process (hybrid stirring) was used in order to improve the distribution of reinforcements in the matrix. T6 heat treatment process was applied afterward. Microstructures were characterized by metallographic analysis, grain size measurement and DAS measurements. Mechanical properties were evaluated with uniaxial tensile tests, charpy tests and hardness tests. The highest values of ultimate tensile strength (UTS) and elongation were obtained with 0.5 wt% of nano-Al₂O₃ addition among all compositions. Compared to the reference sample, UTS values are increased 8.7% and 3.9% with 0.5 wt. of nano-Al₂O₃ and 1.5 wt% of micro-Al₂O₃ addition, respectively. Moreover, the Charpy impact energy was increased with a maximum of 41% with 0.5% nano-Al₂O₃ addition. As a result, 0.5 wt% of nano-Al₂O₃ addition yields the optimum properties according to the quality index calculations.

在这项研究中，用各种比例（0.5、1.0和1.5 wt％）的Al ₂ O ₃增强的铝A356（AlSi7Mg0.3）合金基复合材料制备具有两种不同粒径（纳米和微米尺寸）的颗粒，并研究了其对铝金属基复合材料力学性能的影响。为了改善增强材料在基体中的分布，使用了超声辅助机械搅拌工艺（混合搅拌）。随后进行T6热处理工艺。通过金相分析，粒度测量和DAS测量来表征微观结构。机械性能通过单轴拉伸试验，夏比试验和硬度试验进行评估。使用0.5 wt％的纳米Al ₂ O ₃可获得极限抗拉强度（UTS）和伸长率的最大值在所有成分中添加。与参考样品相比，UTS值在0.5 wt。％的情况下增加了8.7％和3.9％。分别添加纳米Al ₂ O ₃和1.5wt％的微量Al ₂ O ₃。而且，添加0.5％的纳米Al ₂ O _3时，夏比冲击能最大增加41％。结果，根据质量指数计算，添加0.5wt％的纳米Al ₂ O ₃产生最佳性能。