Effect of ultrasonic vibration on gas-content in molten melt or semi-solid slurry of Al-Si alloys
During the preparation of semi-solid slurry with direct ultrasonic vibration (DUV) process by dipping the horn into the melt, whether the gas-content in the melt would be increased by the cavitation effect of ultrasonic vibration is one of the questions in the development of the USV semi-solid process. By application of quantitative gas-content measurement technique, the effect of ultrasonic vibration on gas-content of both molten melt and semi-solid slurry of Al-Si alloys has been studied. The variations of gas-contents in two kinds of aluminum alloys, i.e., A356 alloy and Al-20Si-2Cu-1Ni-0.6RE alloy (AI-20Si for short), have been studied respectively. The results show that ultrasonic vibration has an obvious degassing effect on the molten melt, especially on the semi-solid slurry of Al-Si alloy which is below the liquidus temperature within 20°C. The ultrasonic degassing efficiency of A356 alloy decreases with the reduction of the initial gas-content, and it is nearly not changed for AI-20Si alloy. The gas-content of both alloys decreases with the increase of ultrasonic vibration time. The best vibration time for AI-20Si alloy at the liquid temperature 710°C and semi-solid temperature 680°C is 60 s and 90 s, and the biggest degassing efficiency is 48％ and 35％, respectively. The mechanism of ultrasonic degassing effect is discussed.
ultrasonic vibration semi-solid slurry aluminum alloy gas content degassing
Wu Shusen Liu Longfei Ma Qianqian Mao Youwu An Ping
State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
国际会议
The 11th Asian Foundry Congress(第11届亚洲铸造会议 AFC-11)
广州
英文
1-6
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）