高功率超声外场下7050合金中的显微疏松  

Micro-Porosity in 7050 Alloy Ingot Under High Power Ultrasonic Field

作　　者：张明[1] 李晓谦[1] 黎正华[1] 许显华[1] 

机构地区：[1]中南大学机电工程学院,现代复杂装备设计与极端制造教育部重点实验室,湖南长沙410083

出　　处：《铸造》2011年第2期136-139,共4页Foundry

基　　金：航空航天用高性能轻合金大型复杂结构件制造的基础研究(2010CB731700)

摘　　要：通过对超声波发生器的优化，研究了高功率超声波对7050铝合金铸锭中显微疏松形成的影响。试验结果表明，高功率超声处理的铸锭的组织更加致密，声流效应更加显著。在试验所用超声功率范围内，超声功率为2600W时除气效率最高，抑制显微疏松形成的效果最佳，铸锭中横截面处显微疏松百分比减少了30．4％～56．3％，中心显微疏松的百分比也减4、了31．1％-53-3％，这表明高功率超声振动能极大降低显微疏松的形成。The ultrasonic generator was used to treat the 7050 aluminum alloy melt so as to study the effect of ultrasonic on micro-porosity of 7075 aluminum alloy ingot. The experimental results show that the high power ultrasound apparently increased the structure compactness of the ingot. In addition, the large-scale acoustic streaming effect was more significant. The highest degassing ability and the optimal micro-porosity restraining result were obtained when the vibrating power is 2 600 W. The cross-sectional micro-porosity percentage was reduced by 30.4%-56.3% and the central micro-porosity percentage was also reduced by 31.1%-53.3%. High power ultrasonic vibration can reduce radically the formation of micro-porosity.

关 键 词：铸造7050合金 显微疏松 高功率超声 声流 除气 补缩 

分 类 号：TG27[金属学及工艺—铸造]