【摘要】 进行了强磁场下Bi-Mn合金的全熔和半固态实验,研究了MnBi相在强磁场中的凝固行为.在10 T强磁场下从全熔态和Curie点以上半固态开始凝固的实验中, MnBi相在360℃左右逐渐形成片状相,其短轴为易磁化轴;加磁场后易磁化轴转向磁场方向,并沿磁场方向定向排列和聚合,最终形成条状组织;片状相在强磁场的作用下有分裂趋势.结合晶体的磁各向异性和生长各向异性的特点,从磁化理论和晶体学出发,分析了Bi-Mn合金初生MnBi相在磁场中的凝固行为.更多还原

【Abstract】 The influence of high intensity magnetic field on the solidified structure and behavior of Bi-6%Mn alloy has been investigated experimentally. The morphology of primary MnBi phase in the alloy cooled to 360 ℃ from melt and hemi-melt above Curie temperature at 10 T magnetic field was blade-like and its short axis is the easy magnetization. Under high intensity magnetic field, the easy magnetization axis turned to the direction of magnetic field and aggregated along the direction of magnetic field, and finally formed lath-like structure. The solidified microstructure of Bi-Mn alloy under magnetic field was discussed on the base of magnetization and crystal growth theory.更多还原