摘 要 研究了超声场对?0mmAl-1wt%Si合金键合线铸坯水平连铸过程的影响，并对其机理进行了探讨。实验结果表明：施加超声处理后，铸坯的表面质量得到了改善，当超声功率达到1000W时，表面粗糙度由未施加超声波时的40靘降为10靘；凝固组织得到了细化，平均晶粒度由94.1靘降为31.2靘；并且力学性能得到了提高，抗拉强度和延伸率分别提高了20.5%和37.5%，硬度也提高了23.9%；同时，Si元素在?#65288;Al）基体中的固溶度及其分布的均匀性得到了提高，晶界偏析得到了抑制，析出的单质Si形貌由不规则的针线状变为具有规则形貌的圆球状。
ABSTRACT In this paper, the effect of ultrasonic field during horizontal continuous casting of ?0mm Al-1wt%Si alloy bonding wire on the solidification has been investigated and the phenomenon has been theoretically interpreted. Experimental results showed that when the ultrasonic power of 1000W was imposed, the surface quality was improved, the surface roughness decreased from 40祄 to 10祄; the solidification structure was refined, the average grain size reduced from 94.1祄 to 31.2祄 and the mechanical properties were enhanced, not only the tensile strength and elongation increased by 20.5% and 37.5% respectively, but the hardness value increased by 23.9%. Meanwhile, the uniformity of the distribution of Si in ?(Al) was improved and the boundary segregation was suppressed, the fine globular microstructure of Si could be effectively obtained.
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