Effect of Ultrasonic Output Power on Refining the Crystal Structures of Ingots and Its Experimental Simulation

Abstract

Abstract: In this study, a series of tests were conducted by using aluminum-based alloy to determine the formation of grain refining structure based on the ultrasonic vibration (UV). Furthermore, the simulation test and effect of ultrasonic output power were studied using ammonium chloride. Finally, the mechanism of grain refinement was investigated. The results show that: (1) By applying the UV to aluminum-base alloy, the grain refining rate of ingots tended to increase with the increase of the output value of UV. (2) It was confirmed that time from after the pour to the beginning of crystallization as well as cloudiness tended to decrease with increasing the ultrasonic power value of UV. Moreover, it can be seen from each cooling curve that a uniform temperature gradient existed in the melt as the power of UV increased, that made the melt strongly stirred. (3) It was also considered that the grain refining effect of ingots, which was observed from the simulation tests, resulted from nucleation action and stirring division action by applying the UV.

Key words: Aluminum alloy, Grain refining, Ultrasonic vibration Simulation

Junwen LI, Tadashi MOMONO. Effect of Ultrasonic Output Power on Refining the Crystal Structures of Ingots and Its Experimental Simulation[J]. J Mater Sci Technol, 2005, 21(01): 47-52.

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