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研究了铸态Tb_(0.27)Dy_(0.73)Fe_x(x=1.65～2.0)化合物的磁致伸缩特性,显微组织与Fe含量x之间的相互关系规律。当x=19时,铸态的λ_(11)、λ_(11)-λ_和(dλ/dH)_m具有最大值。该合金的第二相数量最少,单相性较好。基体相Tb_(0.27)Dy_(0.73)Fe_(2.0)具有MgCu_2型结构。当x≥1.95时,合金出现RFe_3相魏氏体组织,贯穿基体相晶粒,导至磁致伸缩特性下降。当x≤1.85时,合金出现网络状的离异共晶组织和鱼骨状的共晶组织。随x的降低,共晶相数量增加并粗化,从而导致磁致伸缩特性下降。
The magnetostrictive properties of the as-cast Tb_ (0.27) Dy_ (0.73) Fe_x (x = 1.65 ~ 2.0) compound and the relationship between the microstructure and the Fe content x were studied. When x = 19, the as-cast λ_ (11), λ_ (11) -λ_ and (dλ / dH) _m have the maximum value. The alloy has the least amount of second phase and good single phase. The Tb_ (0.27) Dy_ (0.73) Fe_ (2.0) matrix has a MgCu_2 structure. When x≥1.95, the alloy shows the microstructure of the RFe_3-phase Wets, which runs through the matrix grains and leads to the decrease of magnetostrictive properties. When x≤1.85, the network appeared dissimilar eutectic and fish bone eutectic. With the decrease of x, the number of eutectic phases increases and coarsens, resulting in a decrease in magnetostriction.