原位反应铸造半固态7075铝基复合材料的组织  

Microstructure of Semi-solid 7075 Aluminum Matrix Composites Prepared by In-situ Reaction

作　　者：刘慧敏[1] 呼努斯图[2] 廖庆华[1] 张娟[1] 杨爱春[1] 

机构地区：[1]内蒙古工业大学 [2]内蒙古师范大学

出　　处：《特种铸造及有色合金》2006年第9期590-592,共3页Special Casting & Nonferrous Alloys

基　　金：内蒙古工业大学校基金资助项目(ZD200407)

摘　　要：采用原位反应液相线铸造方法制备了含有不同体积分数TiC颗粒的7075半固态铝基复合材料,通过光学显微镜和透射电镜观察其铸态组织,并利用平均截线法测量晶粒尺寸,研究原位颗粒对液相线铸造半固态铝合金组织的影响。结果发现,原位TiC颗粒对半固态铝合金的铸态组织产生细化和球化作用,当原位TiC颗粒体积分数达到2.5%时,材料能够得到等轴晶组织,对应的平均晶粒尺寸为35.6μm。The different volume fractions of TiC particle reinforced 7075 aluminum matrix composites under the conditions of semi-solid state have been fabricated by the in-situ reactive liquidus method. The as-cast microstructure of the composites have been observed by OM (optical microscope) and TEM (transmission electron microscope), and effects of TiC particle on the microstructure of the composites were investigated by measuring the average grain size with a mean linear intercept method. The result showed that TiC particle can obviously refine and spheroidize the as-cast microstructure of semi-solid Al matrix composites. The equaixed structure with average grain size of 35.6 μm in the composites can be observed with 2.5% TiC particle.

关 键 词：液相线铸造 半固态 铝基复合材料 组织 原位颗粒 

分 类 号：TG249.9[金属学及工艺—铸造]