The arrangements of the easy magnetization axis[001]of columnar Nd_(2)Fe_(14)B crystals in the laser scanned layer on anisotropic sintered Nd_(15)Fe_(77)B_(8)magnets were investigated by XRD and the Bitter method.The ...The arrangements of the easy magnetization axis[001]of columnar Nd_(2)Fe_(14)B crystals in the laser scanned layer on anisotropic sintered Nd_(15)Fe_(77)B_(8)magnets were investigated by XRD and the Bitter method.The results show that the common effects of both the heat flux and the substrate magnetization orientation constrain the columnar Nd_(2)Fe_(14)B solidified from the laser melting pool to form the c-axis texture orientated with the same direction as that of the substrate,when the geometric relationship between the heat flux in the laser scanning layer and c-axis texture orientation of the substrate is perpendicular to each other,and if the laser scanning velocity is no less than 25 mm·min^(-1).The c-axes of columnar Nd_(2)Fe_(14)B crystals are no longer randomly distributed in the plane normal to their preferential growing direction as they are randomly done in both ingots cooled by water-cooling copper mould and directionally solidified Nd-Fe-B rods.展开更多
基金This work was financially supported by the Zhejiang Provincial Natural Science Fund of China(No.M503096)by Ministry of Science and Technology(No.2004CCA04000).
文摘The arrangements of the easy magnetization axis[001]of columnar Nd_(2)Fe_(14)B crystals in the laser scanned layer on anisotropic sintered Nd_(15)Fe_(77)B_(8)magnets were investigated by XRD and the Bitter method.The results show that the common effects of both the heat flux and the substrate magnetization orientation constrain the columnar Nd_(2)Fe_(14)B solidified from the laser melting pool to form the c-axis texture orientated with the same direction as that of the substrate,when the geometric relationship between the heat flux in the laser scanning layer and c-axis texture orientation of the substrate is perpendicular to each other,and if the laser scanning velocity is no less than 25 mm·min^(-1).The c-axes of columnar Nd_(2)Fe_(14)B crystals are no longer randomly distributed in the plane normal to their preferential growing direction as they are randomly done in both ingots cooled by water-cooling copper mould and directionally solidified Nd-Fe-B rods.
