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采用不同强度超声对AZ80镁合金熔体进行处理以改善合金的凝固组织。当施加的超声强度为30.48W/cm2时,合金的平均晶粒尺寸由未经超声处理时的303μm降低为148μm。为了进一步了解超声改善镁合金微观组织的机理,采用数值模拟的方法研究超声声压对空化泡行为的影响,并且对熔体中的超声场分布情况进行分析。结果表明,熔体内不同位置所受的声压是不同的,因此不同位置上的铸锭试样的晶粒细化程度也不同。随着超声强度的增加,声压值增加,而合金的晶粒尺寸则随之降低。
The AZ80 magnesium alloy melt was treated with different intensities of ultrasound to improve the solidified structure of the alloy. When the applied ultrasonic intensity was 30.48W / cm2, the average grain size of the alloy was reduced from 303μm without ultrasonic treatment to 148μm. In order to further understand the mechanism of ultrasound to improve the microstructure of magnesium alloy, the effect of ultrasonic pressure on cavitation bubble behavior was investigated by numerical simulation and the distribution of ultrasonic field in melt was analyzed. The results show that the sound pressures at different locations in the melt are different, so the degree of grain refinement of ingot samples at different locations is also different. As the ultrasonic intensity increases, the sound pressure increases, while the alloy grain size decreases.