In the present work, in-situ Al₃Ti/2024Al composites with different amount of Al₃Ti reinforcements were fabricated by ultrasonic casting method. The effects of solution and subsequent aging treatment on the microstructures and mechanical properties were studied. The results show that solution at 500 °C for 6 h is suitable for in-situ Al₃Ti/2024Al composites with mass fractions of reinforcements between 4 wt% and 16 wt%. The aging kinetics of Al₃Ti/2024Al composites was promoted by the Al₃Ti reinforcements. When the mass fraction of Al₃Ti is increased from 0% to 16%, the peak hardness is increased by 20.3%, and the time required to reach the peak hardness is shortened by 66.7%. The microstructures of peak-aged Al₃Ti/2024Al composites consist of equiaxed α-Al grains and evenly distributed reinforcing particles. As the mass fraction of Al₃Ti increasing, the compression and tensile strengths were both increased gradually at the sacrifice of plasticity.

在本工作中，通过超声铸造法制备了具有不同数量的Al ₃ Ti增强材料的原位Al ₃ Ti / 2024Al复合材料。研究了固溶和随后的时效处理对组织和力学性能的影响。结果表明，在500°C下固溶6 h适用于原位Al ₃ Ti / 2024Al复合材料，增强材料的质量分数在4 wt％和16 wt％之间。Al的动力学老化₃的Ti / 2024Al复合材料是由铝促进₃的Ti增援。当Al ₃的质量分数Ti从0％增加到16％，峰值硬度增加20.3％，达到峰值硬度所需的时间缩短了66.7％。峰时效Al ₃ Ti / 2024Al复合材料的微观结构由等轴α-Al晶粒和均匀分布的增强颗粒组成。随着Al ₃ Ti的质量分数的增加，抗压强度和抗拉强度都逐渐增加，而牺牲了可塑性。