高能超声波处理对细化过共晶Al-20%Si合金中硅相的影响  

Effects of high-intensity ultrasonic treatment on primary silicon of Al-20%Si alloy

作　　者：于浩[1,2] 程和法[1,2] 黄笑梅[1,2] 程兆虎[1,2] 钱怡君[1,2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽省有色金属材料与加工工程实验室,安徽合肥230009

出　　处：《材料热处理学报》2012年第12期58-63,共6页Transactions of Materials and Heat Treatment

基　　金：安徽省自然科学基金(090414197)

摘　　要：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.

关 键 词：AL-20%SI合金 超声波处理 微观组织 

分 类 号：TG292[金属学及工艺—铸造]