采用高能超声波对过共晶Al—20%Si合金进行熔体处理,研究超声波对Al-20%Si合金微观组织的细化效果和作用规律。结果表明,在Al-20%Si合金凝固过程中对其进行超声波处理,可以破碎组织中粗大板片状初晶硅,使晶粒尺寸变小,圆整度提高、分布均匀;提高超声波功率,可以增强对铝硅合金微观组织的细化效果并使熔体中组织细化的区域扩大;实验结果还表明,在熔体中不同位置导入超声波进行处理,对整体组织的作用效果有较大区别,在熔体中心位置较浅深度导入超声波时,所获得的组织细化区域较大,并且组织分布均匀。
Refining effects of high-intensity ultrasonic treatment on primary Si of hypereutectic A1-Si alloy were investigated by processing Al-20% Si alloy melt under the high-intensity ultrasonic field during solidification. The results show that with the high-intensity ultrasonic treatment, the thick plate primary Si in Al-20% Si alloy is refined to spherical shape and crystal dimension is diminished, and the round and homogeneous grains are obtained. The effects of refinement are more remarkable with increasing the power of ultrasonic. It is found that the position of introducing ultrasonic in the melt significantly influence the microstructure of Al-20% Si alloy. The better refinement results on the microstructure of Al-20% Si alloy can be obtained by ultrasonic treatment at a shallow depth and a center of the metal melt.
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