Abstract
In this paper, the effects of single-frequency ultrasonic treatment (SUT) and dual-frequency ultrasonic treatment (DUT) on the microstructure and mechanical properties of AZ80 magnesium alloy were investigated by numerical simulation and experimental research. Numerical simulation shows that the effective cavitation area of 15 kHz SUT is about twice that of 20 kHz, while the cavitation area of the 15 + 20 kHz DUT is larger than the sum of two SUT. The experimental results find that grains are refined after ultrasonic treatment, while the refinement effects of SUT and DUT are different. Under the same power condition, the refinement effect of 15 kHz is better than 20 kHz, but the DUT has higher efficiency than both SUT. The average grain size of untreated ingot is 174 μm, which is reduced to 123 μm, 99 μm and 80 μm after 20 kHz SUT, 15 kHz SUT and 15 + 20 kHz DUT, respectively. Therefore, applying DUT is more efficient in refining the grain size of the AZ80 magnesium alloy.
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