超声施振方式对纯铝凝固组织细化规律的研究  

Research on the Solidification Structure Refining Laws of Pure Aluminum Under Different Methods of Ultrasonic Vibration

作　　者：蒋日鹏[1] 李晓谦[1] 张立华[1] 张雪[1] 吴钰[1] 谢恩华[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《材料工程》2009年第2期6-10,共5页Journal of Materials Engineering

基　　金：国家973计划资助项目(2005CB23707)

摘　　要：分别采取静态连续施振和动态间歇施振两种方式对工业纯铝熔体进行超声处理,并根据空化效应和声流效应理论详细分析了铸锭凝固组织的细化规律。实验结果表明,两种施振方式对凝固组织均有不同程度的细化。连续施振条件下,不同的超声功率对组织的细化效果有所不同。当选取施振功率为170W时,组织细化作用最强,所得晶粒尺寸最小。间歇施振条件下,当超声功率从大到小加载时,组织细化较为理想。每隔不同温度施以不同时间的超声振动时,若处理时间与温度选取适当则能获得比连续施振时更为细小的组织。Industrial aluminum melt was treated by ultrasonic with two methods： applying static continuous vibration and dynamic intermittent vibration. And the solidification structure refining laws was analyzed according to the theory of cavitation and acoustic effects. The results indicate that solidification structures are both refined to different extents by two ways. Under the condition of continuous vibrating, structure refining effects are diverse with different ultrasonic powers. Structure refi- ning effect is best and the grain size is smallest when applying vibrating power 170W. Under the condition of intermittent vibrating, when ultrasonic power varies from small to large, structure refinement is more perfect. Better structure can be obtained if treating time and temperature selected correctly during the process of applying ultrasonic vibration for different time at the diverse temperatures.

关 键 词：铝熔体 施振方式 超声振动 凝固组织 晶粒 

分 类 号：TB559[理学—物理] TG249.9[理学—声学]