Effect of Ultrasonic Vibration on the Solidification Structure of Low Melting Point Alloy

The effect of ultrasonic vibration on the solidification structure of low-melting-point alloys Eskin et al. conducted a more in-depth study on the solidification process of aluminum alloys using 10kW ultrasonic waves. Tests have shown that the tensile strength of pure aluminum can be increased by 6-10% after ultrasonic treatment, while the tensile strength of aluminum with trace elements can be increased by 20-25% after ultrasonic treatment. In continuous casting, ultrasonic treatment of Al-Si alloy has also achieved good results, and the effect on the refinement of the primary Si phase is very significant. Li Yinglong and others studied the effect of ultrasonic treatment on the structure and properties of Al-Si alloys during the whole process and before crystallization. The experimental results show that the whole process of ultrasonic treatment with a sound intensity of 3.5W/cm2 significantly refines the eutectic Si phase, fractures and distributes in granular form, and there is local melting at the fracture, and the edges and corners become blunt. Although the ultrasonic treatment before crystallization with the same sound intensity can also refine the eutectic silicon, it is still distributed in needles and the crystal grains are not broken. Zhao Zhongxing et al. used the bottom lead method to ultrasonically treat aluminum alloy. The alloy structure after ultrasonic treatment is obviously refined, dendrites are broken, and uniform equiaxed or granular crystal structure is formed.