采用高真空电弧炉制备了Tb0.3Dy0.7Fe1.95-xNbx(x=0,0.03,0.06,0.09)合金,研究了该系列合金的晶体结构、微观组织及磁致伸缩性能.结果表明:添加Nb元素后的Tb0.3Dy07Fe1.95-xNbx(x=0.03,0.06,0.09)合金基体相结构仍保持为MgCu2(C15型)立方Laves相,添加Nb后Tb0.3Dy0 7Fe1.95-xNbx合金基体相晶格常数几乎不变.Nb在基体相RFe2中和富Re相中都不溶,但在x=0.03时的RFe3相中微溶而形成Re(Nb,Fe)3相.初生相NbFe2(C14型)相的形成使凝固液体富稀土从而抑制了RFe3有害相形成.六方结构的NbFe2在与自身结构不同的RFe2(C15型)中不溶而单独成为一相存在于RFe2基体上.Nb的添加量x对磁致伸缩的影响很大,微量(x=0.03) Nb的添加有效抑制了RFe3有害相的生成而使得磁致伸缩性能提高最大,但当Nb含量继续增大时,由于顺磁相NbFe2和富Re相的析出影响了基体磁-弹性交互作用而使磁效伸缩性能下降.但相对于Tb0.3Dy0.7Fe1.95母合金都有少量提高.
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