功率超声对Al-Si合金凝固过程中溶质偏析的抑制效应

研究了功率超声作用下，直径为10 mm Al-1%Si合金键合线水平连铸坯的微观组织形貌以及溶质元素在基体中的分布情况.实验结果表明：在功率超声作用下，铸坯的凝固组织得到了细化，Si元素在α(Al)基体中的固溶度及其分布的均匀性得到了提高，溶质偏析得到了抑制.从功率超声对Al-1%Si合金凝固过程中的溶质扩散，结晶温度间隔，液穴形态，温度场和流动场以及合金微观组织形貌的影响出发，尝试性地对功率超声抑制溶质元素微观偏析的机理进行探讨性的解释和说明. 关键词： 功率超声 水平连铸 Al-1%Si合金 溶质偏析

Effect of high-intensity ultrasound on restraining solute segregation in Al-Si alloy casting process

The influence of high-intensity ultrasound on the microstructure and the distribution of solute elements Si in α (Al) of Φ10mm Al-1% Si alloy bonding wire produced by horizontal continuous casting have been investigated. Experimental results show that under high-intensity ultrasonication the microstructure is refined, the solid solubility and the uniformity of the distribution of Si in α (Al) are improved and the solute segregation is suppressed. The effect of high-intensity ultrasonic vibration on restraining solute segregation in Al-1% Si alloy ingot in horizontal continuous casting is explained from such factors as the diffusion of solute, solidification interval, solidifying front shape, temperature field, flow pattern and microstructure.