(东北大学理学院， 沈阳110006)
摘 要: 用X射线衍射和穆斯堡尔谱研究了快凝Al-Fe-V-Si-Nd合金的组织结构， 并用与时间有关的非均匀形核理论计算了在快凝过程中合金第二相α-Al13（Fe,V）3Si和Al8Fe4Nd的起始形核温度与形核过冷度。 结果表明， 在相同的冷却速度下，亚稳相Al8Fe4Nd的形核孕育期短， 并且满足优先形核的动力学条件而析出，α-Al13（Fe,V）3 Si相被抑制。
关键字: 弥散相； 快凝； 相选择； 孕育期
（College of Science, Northeastern University, Shenyang 110006, P.R.China）
Abstract:The microstructures of rapidly solidified (RS) Al-Fe-V-Si-Nd alloys were investigated using X-ray diffraction and Mossbauer spectroscopy. Time depended nucleation theory was applied to calculate the nucleation temperatures and under coolings for the competing phases of α-Al13（Fe,V）3Si and Al8Fe4Nd. It was found that the incubation time of the metastable phase Al8Fe4Nd is shorter and the kinetics condition for Al8Fe4Nd to form as the primary phase during the RS procedure is satisfied, which results in the depressing ofα-Al13（Fe,V）3Si phase in RS alloy with 1%（mass fraction）Nd.
Key words: dispersed phase； rapid solidification； phase selection； incubation time
