稀土和磷复合变质对过共晶铝——硅合金硅晶体形貌与力学性能的影响  

Influences of RE and P Complex Modifications on the Shape of Silicon Crystals and Mechanical Properties of Hypereutectic Al-Si Alloy

作　　者：孟繁琴[1] 

机构地区：[1]佳木斯大学工学院

出　　处：《稀土》1998年第2期61-64,共4页Chinese Rare Earths

摘　　要：采用扫描电镜、Ｘ射线衍射、材料性能检测等实验手段对复合变质处理后的过共晶铝硅合金显微组织、形貌和力学性能进行了分析。结果表明：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缩小且棱角钝化；较大针状的共晶硅变为颗粒状，使显微组织明显细化，从而导致过共晶铝硅合金的力学性能显著提高。By means of XRD,SEM and other tools,the paper studies microstructures,shapes and mechanical properties of primary crystal and eutectic silicon of Al-Si alloy treated by P and RE complex modifications.The results show that the coarse block and stripe primary crystal silicons decrease and their edges and angles are passivated,the large needle eutectic silicons can be changed to the fine lamella or particle ones.Hence the microstructures are obviously fined down and the mechanical properties can be greatly improved.

关 键 词：过共晶 力学性能 显微组织 铝硅合金 变质处理 

分 类 号：TG146.21[一般工业技术—材料科学与工程]