高<111>取向Tb_(0.3)Dy_(0.7)Fe_(1.9)合金的制备

Preparation of Tb_(0.3)Dy_(0.7)Fe_(1.9) alloy with high orientation along <111>

巨磁致伸缩材料Tb0.3Dy0.7Fe1.9沿易磁化轴《111》取向有着远优于其他取向的性能,探索制备该合金沿《111》取向的方法将提高这类稀土铁材料的应用价值.当材料在静磁场中凝固时,尽管Tb0.3Dy0.7Fe1.9的熔点远高于材料的铁磁相变Curie点,理论上这种高熔点的铁磁类材料在不是很强的静磁场作用下有实现易轴取向生长的可能性.在Tb0.3Dy0.7Fe1.9的凝固实验中,施加1T的静磁场,材料在慢凝的过程中获得了平行于磁场方向的高《111》取向.实验结果证实了理论分析,这一方法也应适用于其他高熔点铁磁性材料.

In regard to giant magnetostrictive materials, the Tbo.3Dyo.7Fel.9 alloy with easy magnetic axes along the （111） orientation, is greatly superior in applications to that those of other orientations. Investigations exploring new methods to prepare this alloy with strong （111） orientation would be of benefit, as they would enhance the application merits of those Re-Fe materials. Although the melting pointing of this ferromagnetic alloy is far above its Curie point, under average magnetic fields, there is a theoretical possibility of achieving crystal growth along the easy magnetic axes during solidification. In experiments to solidify this alloy, a static magnetic field of 1 T was applied, and under slow-cooling conditions a strong （111） orientation paralleling the field was obtained. Results from follow-up experiments confirmed the theoretical analysis. This preparation technique could also be used for other magnetic materials, especially ferromagnetic materials.