凝固时超声振动处理对工业纯铝显微组织的影响  

Effect of Ultrasonic Vibration in Solidification on Microstructure of Industrial Pure Aluminum

作　　者：蒋日鹏[1] 李晓谦[1] 胡仕成[1] 张立华[1] 刘荣光[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《机械工程材料》2008年第10期14-17,21,共5页Materials For Mechanical Engineering

基　　金：国家"973"计划资助项目(2005CB23707)

摘　　要：对工业纯铝熔体进行超声振动处理,分别研究了稳态连续超声处理时不同的超声功率、施振熔体温度、施振深度对凝固后显微组织的影响;并分析了动态间歇施振对凝固组织的影响。结果表明:超声振动下获得的铸锭组织均得到不同程度的细化;超声细晶机理主要是由于空化效应和声流效应提高了形核速率,并抑制了晶粒的长大;运用合理的超声功率与施振温度处理铝熔体,晶粒能得到最有效的细化;此外,施振深度不宜过大,否则将减弱细化效果;不同方式的动态间歇施振后晶粒细化程度与所选参数密切相关。Industrial aluminum melt was treated by ultrasonic vibration above liquidus temperature.The effects of ultrasonic powers,melt temperatures and depths of applying vibration with continuous ultrasonic processing on solidification microstructure were studied.The effects of dynamic intermittent vibration on solidification microstructure were also analyzed.The results indicate that the microstructures of ingot casting through ultrasonic vibration were all refined to different extents.Mechanism of ultrasonic grai...

关 键 词：超声振动 工业纯铝 空化效应 声流效应 

分 类 号：TG292[金属学及工艺—铸造]