Tb_(0.3)Dy_(0.7)Fe_(1.95-x)Nb_x(x=0,0.03,0.06,0.09)合金的组织与磁致伸缩性能  

Microstructure and Magnetostriction of Tb_(0.3)Dy_(0.7)Fe_(1.95-x)Nb_x(x=0,0.03,0.06,0.09) Alloys

作　　者：李晓诚[1] 丁雨田[1,2] 胡勇[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《稀有金属材料与工程》2012年第11期2045-2048,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(11004091);浙江省自然科学基金(Y4090219);甘肃省自然科学基金(0916RJZA025)

摘　　要：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Tb0.3Dy0.7Fe1.95-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。The Tb0.3Dy0.7Fe1.95-xNbx（x=0,0.03,0.06,0.09） alloys were prepared by a high-vacuum arc melting furnace.The crystal structure,microstructure and magnetostriction of the alloys were studied.Results demonstrate that after Nb addition the matrix phase of the Tb0.3Dy0.7Fe1.95-xNbx（x=0.03,0.06,0.09） alloys consists predominantly of the cubic Laves phase with MgCu2（C15-type） structure,and the lattice parameter of the Laves phase in the alloys is least affected.Nb is soluble negligibly in the matrix RFe2 and Re-rich phases,but dissolved in the RFe3 phase and formed into Re（Nb,Fe）3 phase when x=0.03.The formation of the NbFe2 phase as the primary phase make the solidifying liquid become rich in rare earths and suppress the formation of the deleterious RFe3 phase.The hexagonal C14-type Laves phase NbFe2 does not dissolve into the matrix RFe2（C15-type） phase.The concentration of the element Nb affects the magnetostriction significantly.The improvement in magnetostriction is maximum for the element-added alloy with a low concentration of the element Nb（x=0.03） as compared to the parent alloy Tb0.3Dy0.7Fe1.95.However,the decrease in magnetostriction occurs with the increasing of Nb content which is due to the formation of paramagnetic phases NbFe2 and Re-rich phases.Whereas the magnetostriction has a little improvement as compared to the parent alloy Tb0.3Dy0.7Fe1.95.

关 键 词：Tb-Dy-Fe合金 磁致伸缩 Nb元素添加 显微组织 LAVES相 

分 类 号：TB34[一般工业技术—材料科学与工程]