复合变质对过共晶铝硅合金晶体形貌的影响  

Influences of Complex Modifications on the Shape of Silicon Crystals of Hypereutectic Al-Si Alloy

作　　者：孙淑红[1] 张家涛[1] 彭著刚[1] 王凯[1] 樊刚[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093

出　　处：《昆明理工大学学报（理工版）》2005年第1期22-24,共3页Journal of Kunming University of Science and Technology(Natural Science Edition)

基　　金：云南省自然科学基金 (项目编号 :2 0 0 1E0 0 11M )

摘　　要：采用光学显微镜等手段对复合变质处理后的过共晶铝硅合金显微组织、形貌进行了分析 .结果表明 :硅含量为 2 0 %和 2 5 %时 ,经过磷和稀土复合变质后 ,使粗大块状、条状的初晶硅的尺寸明显减小且棱角钝化 ,较大针状的共晶硅变为短杆状或颗粒状 ,使显微组织明显细化 .而磷对含硅量≥ 30 %的铝硅合金的初晶硅的细化效果不是很明显 .By means of optical micrograph and other instruments, microstructures, shapes of primary crystal and eutectic silicon of Al-Si alloy treated by P and RE complex modifications are studied. The results show that when the content of silicons is 20% or 25%, the coarse block and stripe primary crystal silicons decrease, their edges and angles are passivated, and the large needle eutectic silicons can be changed to the fine lamella or particle ones. Hence the microstructures are obviously fined down. When the content of silicons reaches 30%, the coarse block and stripe primary crystal silicons can not be obviously passivated.

关 键 词：过共晶铝硅合金 细化变质 显微组织 

分 类 号：TG292[金属学及工艺—铸造]