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采用KBF4和K2TiF6混合盐反应工艺原位合成制备了TiB2颗粒增强AlSi7Mg0.6合金(TiB2/AlSi7Mg0.6)复合材料,并进行了固溶和时效处理;用光学显微镜、透射电镜和硬度仪对复合材料的显微组织及热处理强化后的性能进行了研究。结果表明:TiB2颗粒显著细化了复合材料的显微组织;固溶处理后复合材料达到硬度峰值的时效时间较基体合金缩短,峰值硬度提高幅度小于基体合金的;复合材料中铝基体晶粒细小、晶界面积大,导致时效强化相在晶内的析出量不足,是复合材料时效硬度提高幅度下降的主要原因。
The TiB2 particle reinforced AlSi7Mg0.6 alloy (TiB2 / AlSi7Mg0.6) composite was prepared by in-situ synthesis of KBF4 and K2TiF6 mixed salt reaction process. The composite was treated by solution and aging treatment. The microstructure of the composite was characterized by optical microscope, transmission electron microscope The microstructure of the material and the properties after heat treatment were investigated. The results show that TiB2 particles remarkably refine the microstructure of the composites. The aging time of the composites after the solution treatment is shorter than that of the matrix alloy, and the peak hardness increases less than that of the matrix alloy. The grain size of the aluminum matrix in the composite is small , The grain boundary area is large, resulting in insufficient precipitation of the aging strengthening phase in the crystal, which is the main reason for the decrease of the increasing extent of the aging hardness of the composite material.