Zr对过共晶铝硅合金中初生硅组织的影响  

Effect of addition of Zr on as-cast microstructure of hypereutectic Al-Si alloy

作　　者：陈霖[1] 赵玉涛[1] 贾志宏[1] 陈登斌[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《功能材料》2012年第17期2360-2362,2368,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50971066)

摘　　要：采用金相显微镜、扫描电镜、X射线衍射仪等实验手段,研究了质量分数为1%、3%和5%的Zr对Al-20Si铝合金铸态组织的影响。结果表明,随着Zr质量分数的增加,初生硅颗粒尺寸逐渐变大。加入Zr后,反应生成了AlSi4Zr5,毒化了形核核心,使晶粒长大;同时Zr使初生硅周围分枝状的α-Al"晕圈"形成充分,减小了对初生硅生长的抑制。The effects of addition of Zr whose content was 1%,3% and 5% on as-cast microstructure of Al-20Si aluminum alloy were investigated using optical microscope,scanning electron microscope,X-ray diffraction,etc.The results showed that the size of primary silicon particles became bigger gradually with the increasing of the content of Zr.After the addition of Zr,the AlSi4Zr5 was obtained,and Zr poisoned the nucleuses causing the grain size growth;at the same time,α-Al dendritic halos surrounding the primary silicon particles were developed fully,and reduced the inhibition effect of growth of the primary silicon.

关 键 词：过共晶铝硅合金 初生硅 ZR 

分 类 号：TG13[一般工业技术—材料科学与工程]