施振功率与温度对工业纯铝凝固组织的影响  

Effects of ultrasonic power and temperature subjected to vibration on the solidification structure of industrial pure aluminum

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

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《北京科技大学学报》2008年第11期1260-1265,共6页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(No.2005CB23707)

摘　　要：在工业纯铝的凝固过程中引入超声场,探讨了超声细化晶粒的机理,并具体研究了超声功率、导入声波的熔体温度区间对铸锭凝固组织的影响规律.实验结果表明:铝熔体经超声处理后,凝固组织均得到显著细化,这主要取决于超声的空化效应和声流效应;超声功率增大时,组织细化程度提高,功率达到170W时细化效果最好,继续增大功率则细化作用减弱;施振温度区间对凝固组织的影响也有相似的规律,在合理的温度导入声波,晶粒能细化到最佳程度.Ultrasonic field was introduced into the solidification process of industrial pure aluminum. The mechanism of grain refinement by ultrasonic was discussed. The effects of ultrasonic power and melt temperature range subjected to ultrasonic vibration on the solidification structure of casting ingots were studied. The experiment results showed that the solidification structures of aluminum melt were all refined remarkably by ultrasonic treatment due to ultrasonic cavitation effect and acoustic stream effect. The structure refinement was improved when the ultrasonic power increased, the refining effect was the best at the ultrasonic power of 170 W, but it would be decreased if the ultrasonic power continuously increased. The similar law was found in investigating the influence of temperature range applying vibration on the solidification structure, and the grain refinement can reach an optimum degree at a reasonable temperature applying ultrasonic.

关 键 词：工业纯铝 熔体温度 凝固组织 空化效应 声流效应 晶粒尺寸 超声功率 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TQ113.247[金属学及工艺—金属材料]