Solidification Microstructure Evolution Induced by Ultrasonic Vibration

摘要：

The solidification of Pb-Sn hypoeutectic and eutectic alloys is accomplished by introducing ultrasonic vibration with a frequency of 16 kHz into alloy from sample top.As the ultrasound power increases,the primary (Pb) phase in Pb-Sn hypoeutectic alloy exhibits a microstructural transition of equiaxed dendrite fragmented dendrite spherical structure.A lot of eutectic grains appear in both hypoeutectic and eutectic alloys,and the crystal lattice constants of (Pb) and (Sn) phases are reduced.Moreover,if the ultrasound power is higher enough,the periphery of Pb-Sn alloy can be disintegrated into many small spheres.Theoretical analyses indicate that the fragmented dendrites should be mainly caused by ultrasonic streaming and surface wave,whereas the globular growth of primary phase and eutectic grains by ultrasonic cavitation.

关键词： ultrasonic vibration alloy solidification cavitation streaming surface wave

作者: ZhenYu Hong Wei Zhai Bingbo Wei

作者单位: Department of Applied Physics Northwestern Polytechnical University,Xian 710072,P.R.China

会议类型: 国际会议

会议名称: The 4th International Workshop on Piezoelectric Materials and Applications in Actuators(第四届国际压电材料及其在作动器上的应用研讨会)

会议地点: 南京

会议语种:英文

页码: 58-67

在线出版日期: 2007-09-09（万方平台首次上网日期，不代表论文的发表时间）