In the present research, aluminum metal matrix composites were processed by the stir casting technique. The effects of TiB₂ reinforcement particles, severe plastic deformation through accumulative roll bonding (ARB), and aging treatment on the microstructural characteristics and mechanical properties were also evaluated. Uniaxial tensile tests and microhardness measurements were conducted, and the microstructural characteristics were investigated. Notably, the important problems associated with cast samples, including nonuniformity of the reinforcement particles and high porosity content, were solved through the ARB process. At the initial stage, particle-free zones, as well as particle clusters, were observed on the microstructure of the composite. However, after the ARB process, fracturing phenomena occurred in brittle ceramic particles, followed by breaking down of the fragments into fine particles as the number of rolling cycles increased. Subsequently, composites with a uniform distribution of particles were produced. Moreover, the tensile strength and microhardness of the ARB-processed composites increased with the increase in the reinforcement mass fraction. However, their ductility exhibited a different trend. With post-deformation aging treatment (T6), the mechanical properties of composites were improved because of the formation of fine Mg₂Si precipitates.

在目前的研究中，铝金属基复合材料是通过搅拌铸造技术加工的。TiB ₂的影响还评估了增强颗粒、通过累积轧制粘合 (ARB) 产生的严重塑性变形以及时效处理对微观结构特征和机械性能的影响。进行了单轴拉伸试验和显微硬度测量，并研究了显微组织特征。值得注意的是，与铸造样品相关的重要问题，包括增强颗粒的不均匀性和高孔隙率，通过 ARB 工艺得到了解决。在初始阶段，在复合材料的微观结构上观察到无颗粒区和颗粒簇。然而，在 ARB 工艺之后，脆性陶瓷颗粒出现了破裂现象，随着轧制次数的增加，碎片会分解成细小的颗粒。随后，生产出颗粒分布均匀的复合材料。此外，ARB 处理的复合材料的拉伸强度和显微硬度随着增强体质量分数的增加而增加。然而，它们的延展性表现出不同的趋势。通过变形后时效处理（T6），复合材料的力学性能因微细Mg的形成而得到改善₂ Si沉淀。