超声波处理对过共晶Al-20%Si合金组织的影响  

Influence of ultrasonic treatment on microstructure of hypereutectic Al-20%Si alloy

作　　者：程和法[1,2] 黄笑梅[1,2] 杨俊[1,2] 程兆虎[1,2] 刘铭[1,2] 吴玉程[1,2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安微合肥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》2011年第3期35-39,共5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Al-20%Si合金进行熔体处理,研究超声波处理对Al-20%Si合金微观组织形貌的影响。控制Al-20%Si合金熔体温度在620～680℃之间时,研究合金凝固组织随熔体温度和超声波处理参数的变化规律。结果表明,随着导入超声波输出功率的增大和处理时间的延长,Al-20%Si合金的初晶硅形貌由粗大的板片状逐渐变成细小的球状颗粒;超声波处理熔体的温度控制在660℃左右时,可以获得最佳的效果,初晶硅的尺寸细小、圆整度高、分布均匀。A hypereutectic Al-20% Si alloy was treated by high-intensity ultrasonic,and the effects of ultrasonic treatment on microstructure of the Al-20% Si were studied.The variation of solidified microstructure of the alloy with ultrasonic parameters and temperature of the melt was examined for Al-20% Si alloy melt with ultrasonic treatment at 620-680 ℃.The results indicate that with increase of ultrasonic power and the treating time,coarse block and plate primary silicon is modified to be in finer nodular or polygonal shape.The optimum microstructure with fine and homogeneous distribution of primary Si phase is obtained for the Al-20% Si alloy by ultrasonic treatment at 660 ℃.

关 键 词：超声波处理 AL-20%SI合金 微观组织 

分 类 号：TG292[金属学及工艺—铸造]