Abstract
The effect of ultrasound, chilled radiating face and dissolved Ti on the grain refinement of 7085 Al alloys was investigated in this paper. It was found that small equiaxed grains occurred below the chilled radiating face, and the coarse dendrites formed below the preheated radiating face. However, the dissolved Ti from the eroding radiator cannot generate grain refinement under ultrasonic vibration, which is different from the previously reported result that Ti is a powerful grain refiner. Significant grain refinement can be induced when the ultrasound was introduced through a preheated radiator between 650 °C and 620 °C. The grain refinement, involved in the 7085 Al alloys under ultrasonic vibration, is mainly attributed to the heterogeneous nucleation and acoustic streaming.
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