Abstract The effect of an ultrasonic temperature and output power on microstructure and mechanical properties of 6063 aluminum alloy during solidification was investigated by optical microscopy, hardness test, tensile test, SEM. The results showed that compared with the grains in samples without UST, those of under UST are much finer. The grain size approaches to about 80 μm at 750 °C and 600 W and the grain size decreases continuously with falling of test temperature. The grain refinement is significantly affected by temperature than the output power of ultrasonic sound. After UST, the intermetallic phases volume fraction is about 6%, which is much smaller than that (about 11%) of without UST, and no dendrites exsist in the samples after UST. The fracture surface is more uniform without UST, and the reduction of cleavage plane and showing of a typical tearing characteristic demonstrates great improvement of this alloy's mechanical properties.

中文翻译：

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超声温度和输出功率对铸态6063铝合金组织和力学性能的影响

摘要 采用光学显微镜、硬度试验、拉伸试验、扫描电镜等方法研究了超声温度和输出功率对6063铝合金凝固组织和力学性能的影响。结果表明，与未加入UST的样品中的颗粒相比，未加入UST的样品中的颗粒要细得多。在 750 °C 和 600 W 时晶粒尺寸接近 80 μm 并且随着测试温度的降低晶粒尺寸不断减小。与超声波的输出功率相比，晶粒细化受温度的影响显着。UST后，金属间相体积分数约为6%，远小于无UST时的（约11%），且UST后样品中不存在枝晶。断面更均匀，无UST，