论文部分内容阅读
以Al-5Cu合金作为研究对象,建立了形核生长的数学模型。采用数值模拟与试验相结合的方法,分析了电磁搅拌、搅拌电流及搅拌频率对合金凝固组织的影响。结果表明,不施加电磁搅拌时,熔体温度梯度较大,获得的凝固组织粗大;施加电磁搅拌时,熔体温度梯度较小,获得的凝固组织均匀细小。在一定范围内,搅拌电流越大,形成的凝固组织越细小;搅拌频率越大,形成的凝固组织越粗大。
Taking Al-5Cu alloy as the research object, a mathematical model of nucleation growth was established. The effects of electromagnetic stirring, stirring current and stirring frequency on the solidification microstructure of the alloy were analyzed by the method of numerical simulation and experiment. The results show that when the electromagnetic stirring is not applied, the temperature gradient of the melt is large, and the solidified structure obtained is coarse. When the electromagnetic stirring is applied, the temperature gradient of the melt is small, and the solidified microstructure obtained is even and small. Within a certain range, the larger the stirring current is, the finer the solidified structure is formed. The larger the stirring frequency is, the thicker the solidified structure is formed.