强磁场下深过冷Co-Sn近共晶合金凝固行为研究

项目名称： 强磁场下深过冷Co-Sn近共晶合金凝固行为研究

项目编号： No.51301137

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 王军

作者单位： 西北工业大学

项目金额： 25万元

中文摘要： 强磁场作为一种极强的物理场，对于材料处理尤其是凝固过程具有重要的影响。到目前为止，对于强磁场下材料的凝固行为已经进行了较为深入的研究，而强磁场对材料非平衡凝固过程中形核及凝固组织的影响机制尚不清楚。本项目以Co-Sn近共晶合金为研究对象，开展强磁场对深过冷熔体的凝固过程影响规律的研究。首先研究强磁场对深过冷熔体中磁性有序结构的形成及形核过程的影响，通过对过冷熔体磁性的测量及计算磁场对形核热力学和动力学的影响机制；其次研究过冷度及磁场强度对Co-Sn合金凝固组织演化过程的影响；最后结合凝固组织、晶粒取向分析和枝晶、共晶生长模型计算，研究强磁场对含不同磁化率相析出时，过冷熔体中规则共晶-非规则共晶的转变机制。通过本项目的实施对深刻理解强磁场作用对非平衡凝固过程中的竞争形核及相选择，揭示强磁场对非平衡凝固共晶合金中的非规则共晶形成机制具有重要的意义。

中文关键词： 强磁场；凝固；形核；共晶；过冷度

英文摘要： As a strong physical means, high magnetic field can strongly affect the material processing, especially for the solidification process.The solidification behavior of materials under strong magnetic field has been investigated systematicaly, however, the non-equilibrium solidifcation especially for the nucleation and solidified microstructure evolustion mechanism under strong magnetic were still not very clear.The present project will focus on Co-Sn binary near eutectic alloy and investigate the effect of the high magnetic field on the solidification process from highly undercooled melt.At first, the formation of magnetic ordering structure in the undercooled melt and its effect on the nucleation process will be investigated under strong magnetic field based on the measuring of the magnetic properties of undercooled melt and calculating of the magnetic field on the nucleation thermodynamics and kinetics. Secondly, we will study the undercooling and field intensity on the microstructure evolution process of Co-Sn alloys. Finally, the regullar to anomalous eutectics transition mechanism will be analyzed incoporating the solidified microstructure,texture analysis, dendrites and eutectics microstructure calculation. Moreover, the present project will be benefit for the understanding of the phase selction and formati

英文关键词： High magnetic field；Solidification；Nucleation；Eutectic；Undercooling