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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 effect of Mn substitution on the properties of polycrystalline Tb_ (0.4) Dy_ (0.6) Fe_ (1.91) alloy bar was investigated. The structure, lattice constant, Curie temperature and magnetism of polycrystalline bar Tb_ (0.4) Dy_ (0.6) (Fe_ (1-x) Mn_x) _ (1.91) (x = 0,0.05,0.10,0.15) It is found that the sample remains MgCu2-type Laves phase structure after Mn substitution for Fe. As the Mn content increases from 0 to 0.15, the lattice constant increases from 7.335 (?) To 7.347 (?), And the Curie temperature decreases from 668K to 526K. The substitution of Mn atoms affects the magnetostrictive properties of the material by changing the exchange interaction, the total magnetic moment and the direction of easy magnetization. The experimental results show that the best performance of Tb_ (0.4) Dy_ (0.6) (Fe_ (1-x) Mn_x) _ (1.91)