Al-Mg-Si合金的凝固过程  

Solidification process of Al-Mg-Si alloys

作　　者：吴锵[1] 孙斐[1] 孙强金[1] 姜石峰 

机构地区：[1]南京理工大学材料科学与工程系,南京210094 [2]韩国机械研究院材料工程部

出　　处：《中国有色金属学报》2000年第5期688-692,共5页The Chinese Journal of Nonferrous Metals

基　　金：韩国科学技术委员会资助!项目 (KIST)

摘　　要：研究了Al Mg Si合金的凝固过程 ,用不同方法测量了合金成分与冷却速度对该合金系铸态组织的影响。通过形态分析确定了Al Mg Si合金的凝固顺序 ,用EPMA测定了非平衡过程的溶质分布 ,并发现FeSiAl4～ 5相成分在高冷速时为FeSiAl5,而在低冷速时为FeSiAl4。晶界附近发现了无溶质带 (NSZ) ,并从固态扩散和凝固溶质再分配两个方面分析了NSZ的形成原因。The solidification process of Al Mg Si alloys was studied. The composition and cooling rate were changed and their influences on as cast microstuctures were studied. The solidification paths of Al Mg Si alloys were determined by the analysis of microstructure. The solute distribution during nonequilibrium solidification process was measured by EPMA . It was found that the composition of FeSiAl 4～5 phase was FeSiAl 5 at high cooling rate and FeSiAl 4 at low cooling rate. No solute zone (NSZ) was found in the matrix in the vicinity of boundary, the mechanism of the formation of NSZ was analyzed with the theories of solid diffusion and solute redistribution. [

关 键 词：铝合金 铸态组织 溶质分布 汽车蒙皮 凝固过程 

分 类 号：U463.832[机械工程—车辆工程] TG146.21[交通运输工程—载运工具运用工程]