摘要
研究了Mn替代Fe对多晶Tb_(0.4)Dy_(0.6)Fe_(1.91)合金棒材性能的影响。分析了Tb_(0.4)Dy_(0.6)(Fe_(1-x)Mn_x)_(1.91)(x=0,0.05,0.10,0.15)多晶棒材的结构、晶格常数、居里温度和磁致伸缩性能,发现Mn替代Fe后,样品仍然为MgCu_2型Laves相结构。随着Mn含量从0增加到0.15,样品的晶格常数从7.335(?)增加到7.347(?),居里温度从668K降低到526K。Mn原子的替代通过改变材料的交换相互作用、总磁矩和易磁化方向影响材料的磁致伸缩性能。实验结果显示,Tb_(0.4)Dy_(0.6)(Fe_(1-x)Mn_x)_(1.91)样品在x=0.10时综合性能最好。
The substitution of Fe by Mn in polycrystalline Tb0. 4 Dy0. 6 Fe1. 91 has been investigated. The structure, lattice constant, Curie temperature, and magnetostriction are examined. The matrix of Tb0.4Dy0.6（Fe1-xMnx）1.91（x=0,0.05,0.10,0.15） are all MgCuz type Laves phase structure. With the increase of Mn content from 0 to 0. 15, the lattice parameter increases from 7. 335A to 7. 347A and the Curie temperature decreases from 668K to 526Ko The sub- stitution of Mn changes exchange interactions, total magnetic moment and the orientation along the rod axis, so the magnetostriction has been affected. The experimental results show at x= 0. 10 the performance of the sample Tb0.4Dy0.6（Fe1-xMnx）1.91 is the best.
