Study On The Solidification Process Of Alloy Treated By High Intensity Ultrasonic

High intensity ultrasonic is a technology based on physics, mechanics, electronics, materials and so on .It is an applied technology that changes some aspects of objects or properties, or its speed is changed by ultrasonic energy. High intensity ultrasonic treatment is one of the effective ways to improve solidification structure and mechanical properties of metals in the process of metal solidification. High intensity ultrasonic melt treatment is used to avoid the action between the alterative and gas in molten alloy, and make the alloy degassing and filtration by ultrasonic vibration.Al-1%Si alloy is adapt to make molectron manufacture bonding wire with good fluidness ,small expansile coefficient, contractive coefficient, resistance of corrupt and good welding capability. High intensity ultrasonic treatment is used to refine the grains, for improve the mechanism property and content the require automatism production. With different solidification process, ultrasonic and technical parameters are studied, such as ultrasonic frequency, ultrasonic power, duration and the temperature. The experiment results indicate that high intensity ultrasonic treatment can help refine the grains and reduce segregation of alloys. With the power grows, the effect of alloy refine is better.After putting the ultrasonic into molten alloys, cavitation and acoustic steam are take place in the melt. Cavitation will collapse at a very speed, then a local zone with high temperature ,pressure and powerful shock wave are formed. That accelerates the nucleation and restrains grains growth. With the stirring of acoustic streaming, temperature and element in the melt become uniformity, the alloy element segregation is reduced.