声悬浮条件下Al-Ge共晶合金中初生(Ge)相的形成与组织特征研究
首发时间:2016-06-01
摘要:在声悬浮与激光辐照相结合条件下实现了Al-51.6%Ge(质量分数)共晶合金的无容器快速凝固。实验发现,Al-51.6%Ge共晶合金的凝固组织主要由二元共晶和初生(Al)枝晶组成。与常规凝固条件不同的是小面相(Ge)的出现,并且在试样的边缘区域,初生(Ge)相的体积分数和溶质含量均显著增大。熔体内部的液相对流和旋转是导致初生(Ge)相形成和体积分数变化的主要原因。计算结果表明,试样边缘区域冷却速率的急剧增大,导致了边缘区域初生(Ge)相的组织细化、固溶度扩展以及生长方式的转变。
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Microstructural Characteristic of Primary (Ge) Phase in Acoustically Levitated Binary Al-Ge alloy
Abstract:In this paper,containerless solidification of eutectic Al-51.6%Ge alloy has been carried out with an ultrasonic levitator. The rapidly solidified microstructure is composed of primary (Al) phase and two phase eutectics. Competitive nucleation between (Al) and (Ge) phases occurs and (Ge) solid solution nucleates as primary phase under ultrasonic levitation condition. The volume fraction and solute content of primary (Ge) phase increase remarkably near the sample edge. The internal convection and rotation are the main factors which dominate the formation of the (Ge) phase. Calculated results indicate that the increase of cooling rate near sample edge results in the transition of microstructure refinement, solubility extension and growth pattern of (Ge) phase.
Keywords: metallic material eutectic alloy acoustic levitation primary phase rapid solidification
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