摘要
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。
TiB2particles reinforced AlSi7Mg0.6alloy(TiB2/AlSi7Mg0.6)composite was prepared by in-situ synthesis method through salt-metal reaction of K2TiF6 and KBF4salts with the molten alloy.The composite was solution treated and aged.The microstructure and property of the composite after strengthening heat treatment were investigated by optical microscopy(OM),transmission electron microscopy(TEM)and hardness test.The results show that particles of TiB2 significantly refine the microstructure of the matrix alloy.After solution treatment the aging time to achieve hardness peak for the composite material was shorter than that of the AlSi7Mg0.6matrix alloy,and the peak hardness increase degree of the composite was smaller than that of the matrix alloy,which was attributable to the insufficient precipitation of strengthening phase because of the fine grain size and large grain boundary area of aluminum matrix.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第9期63-66,共4页
Materials For Mechanical Engineering
基金
国家高技术研究发展计划项目(2006AA03Z568)
关键词
铝基复合材料
原位合成
TIB2
热处理强化
aluminum matrix composite
in-suit synthesis
TiB2
heat treatment strengthening
