电磁搅拌对Al-17Si-4Cu合金组织及偏聚的影响

Effect of electromagnetic stirring on macrostructure and segregation in Al-17Si-4Cu alloy

为提高半固态加工技术制备的铝合金的性能,以Al-17Si-4Cu合金为研究对象,研究了电磁搅拌电流对半固态Al-17Si-4Cu合金组织及Cu元素偏聚的影响.结果表明:电磁搅拌能使初生硅细化和圆整化;使共晶硅数量增多,且分布均匀;能显著改善Cu元素的偏聚现象;但当搅拌电流达到100A时,共晶硅尺寸变大,且Cu元素分布变得不均匀,本实验的最佳电磁搅拌电流为80A.

In order to improve the performance of the aluminum alloy prepared by semi-solid processing technology, this paper studied the influence of the electromagnetic stirring current on microstructure and distribution of Cu elements in semi-solid AI-17Si-4Cu alloy. The results show that the primary silicon becomes refiner and rounder, and the quantity of eutectic silicon increase, which distribute uniformly at the condition of the electromagnetic stirring. At the same time, the electromagnetic stirring improves the segregation of Cu element. When the stirring current is 100A, the size of eutectic silicon becomes larger, and the distribution of Cu element is not uniform. The optimal electromagnetic stirring current is 80A.