扩散，即质量传输，是制约金属凝固和非晶形成的关键过程。利用磁场改变金属的凝固过程是材料改性的新途径。本课题利用自行研制的磁约束金属熔体粘度仪及原子扩散分析仪，研究磁场条件下金属熔体的自扩散系数和合金熔体的互扩散系数，试验比较磁约束与非约束条件下的扩散规律差异。研究金属熔体原子扩散在磁约束条件下对温度梯度和成分浓度的依赖关系，探索磁约束非牛顿流体的温度-扩散系数之间的联系。利用高温熔体X射线衍射仪和扩散分析仪，研究在磁场条件下，原子扩散与原子团簇结构之间的联系及其对凝固过程的影响，建立磁约束金属和合金熔体原子扩散物理模型，找出磁制约凝固过程和非晶形成的物理机制，这将从原子尺度研究金属熔体的热运动，为揭示原子扩散对微观组织形成的影响及微观偏析控制提供新的试验证据和理论研究依据。

Diffusion, namely mass transport，is a key process that restricts the solidification and glass formation for metals. The transformation of the metal solidification processes by means of the magnetic field is a new way to improve the material properties. By using a magnetic confinement viscometer and a diffusion analyzer self-developed for metal melts, we study the self diffusion coefficient and the interdiffusion coefficient for the metal melts under the condition of the magnetic confinement, comparing by the experiment the different diffusion rules between the magnetic confinement condition and the free magnetic confinement. We study the temperature gradient and the component concentration dependence of the metal melt atomic diffusion, exploring the interdependent relationship between the temperature and the diffusion for the non-Newtonian fluid for the metal melts. By using an X-ray diffractometer and the magnetic confinement diffusion analyzer, we research the relationship between the atomic diffusion and the atomic cluster structure and their effects on the solidification, to develop a physical model to describe the atomic diffusion of metal melts under the condition of the magnetic confinement, to find out the physical mechanism of the magnetic confinement solidification and metallic glass formation. This researching work will provide the experimental and the theoretical basis for uncovering the effect of the atomic diffusion on the microstructure transformation and the control of the microsegregation.