【摘要】 利用熔盐-金属反应法成功制备了9 mass%TiB₂颗粒原位增强Al-4.5Cu铝基复合材料，研究超声振动处理对团聚状亚微米TiB₂颗粒分布的改善作用。结果表明：利用超声振动产生的空化效应和声流效应，有效消除了熔体中颗粒团聚的现象。经超声处理4 min后，TiB₂颗粒均匀地分散在整个熔体中，由小于100 nm的TiB₂颗粒形成的微小团聚也被打散。复合材料凝固后，有一些小于400 nm的TiB₂颗粒分散在晶界附近的基体中。超声振动处理4 min后，复合材料的屈服强度比基体合金和未超声振动处理的复合材料分别提高119%和64.3%,这主要是由于超声振动处理使得TiB₂颗粒细小并弥散分布在复合材料的基体中，导致Orowan强化和热膨胀错配强化效果增强，从而使其强度增加。更多还原

【Abstract】 The 9 mass% TiB₂ particles in-situ reinforced Al-4.5Cu aluminum matrix composites were successfully prepared using the molten salt-metal reaction method. The improvement effect of ultrasonic vibration（UV） treatment on the distribution of agglomerated submicron TiB₂ particles was studied. The results show that the cavitation effect and acoustic streaming effect generated by ultrasonic vibration effectively eliminate the phenomenon of particle aggregation in the melt. After 4 min of ultrasonic treatment, TiB₂ particles are uniformly dispersed throughout the entire melt, and small agglomerations formed by TiB₂ particles smaller than 100 nm are also dispersed. After solidification of the composites, some TiB₂ particles smaller than 400 nm are dispersed in the matrix near the grain boundary. After 4 min of ultrasonic vibration treatment, the yield strength of the composites increases by 119% and 64.3% compared to the matrix alloy and the composites without ultrasonic vibration treatment, respectively. This is mainly due to the fine and dispersed distribution of TiB₂ particles in the matrix of the composites caused by ultrasonic vibration treatment, which enhances the Orowan strengthening and thermal expansion mismatch strengthening effects, thereby increasing its strength.更多还原