(上海交通大学 金属基复合材料国家重点实验室， 上海 200030)
摘 要: 利用TiB2颗粒在共晶AlSi基体中易于分散和生成颗粒超细的原理， 用混合盐法制备了原位TiB2颗粒增强ZL109为基体的复合材料。颗粒加入后材料的硬度明显提高，如对颗粒质量分数为8.3%的复合材料材料T6处理后， 其布氏硬度较基体ZL109提高了41.7%。 对不同颗粒质量分数的复合材料固溶时效行为的研究表明，颗粒的加入， 抑制了材料的固溶扩散进程， 加速了复合材料的时效进程。 用有效扩散理论分析了颗粒增强复合材料的固溶时效特性。
关键字: ZL109复合材料； 原位合成； 固溶时效； 有效扩散
（ State Key Laboratory of Metal Matrix Composites,
Shanghai Jiao Tong University, Shanghai 200030, China）
Abstract: The salt-mixture methods were used to synthesize the in-situ TiB2 particles reinforcing Al-Si alloy composites. The composites were inclined to be uniform in ZL109 matrix, and the size of the prepared particles is fine. With the addition of TiB2 particles, the hardness of the composites is improved obviously and the hardness of 8.3% TiB2/ZL109 is improved by 41.7% than that of ZL109 at T6 status. The solution process of the materials is restrained by TiB2 particles, while the aging process of the composites is accelerated by TiB2 particles. The solution and aging behaviors of the composites are analyzed through effective diffusivity theoretical equation.
Key words: ZL109 composites; in-situ synthesis; solution and aging; effective diffusivity
