Al-Mg-Si合金的凝固过程
来源期刊：中国有色金属学报2000年第5期
论文作者：吴锵 孙斐 孙强金 姜石峰
文章页码：688 - 691
关键词：铝合金； 铸态组织； 溶质分布； 无溶质带
Key words：Al-Mg-Si alloys; as-cast microstucture; solute distribution; no solute zone
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。
Abstract: The solidification process of Al-Mg-Si alloys was studied. The composition and cooling rate were changed and their influences on ascast 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 FeSiAl4～5 phase was FeSiAl5 at high cooling rate and FeSiAl4 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.
