合金成分对Tb_xDy_(1-x)Fe_(1.91)磁致伸缩性能影响的研究  

Study of Influence of Alloy Composition on the Magnetostrictive Performance of Tb_xDy_(1-x)Fe_(1.91)

作　　者：邓仲华[1,2] 徐鹏[1] 姚志浩[2] 董建新[2] 国为民[3] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]北京科技大学材料科学与工程系,北京100083 [3]钢铁研究总院高温材料研究所,北京100081

出　　处：《稀土》2017年第2期48-55,共8页Chinese Rare Earths

基　　金：国家自然科学基金项目(51401020);中央高校基本科研基金项目(FRF-TP-14-002A2;FRF-IC-14-003);教育部博士点基金项目(20130006120005)

摘　　要：为了研究TbDyFe合金成分的变化对合金磁致伸缩性能的影响,采用真空感应熔炼炉制备四种Tb_xDy_(1-x)Fe_(1.91)(x=0.22、0.27、0.3、0.35)合金棒,然后取铸态性能较好的试棒真空定向凝固,将定向凝固后的试棒进行真空热处理,测试合金棒的磁致伸缩性能,分析合金中的组织取向,研究材料中的显微组织。研究表明,在低磁场下x=0.27的试样比其他三组实验得到的样品的磁致伸缩性能好,高磁场下x=0.3的样品磁致伸缩性能好而且"jump"效应明显,且定向凝固后的不同取向组织比例对试样的磁致伸缩性能影响很大。组织中的大尺寸富稀土相的产生对合金磁致伸缩性能影响很大。铸态性能较好的Tb_(0.27)Dy_(0.73)Fe_(1.91)合金,在真空环境下热处理后,稀土元素氧化烧损较多,磁致伸缩性能下降剧烈。合金基体主要的相为RFe_2与RFe_3耦合相,烧损导致合金的成分偏离,造成包晶RFe_2相和初生RFe_3相的耦合生长。In order to study the effect of composition change of the alloy on magnetostrictive properties of TbDyFe, four kinds of TbxDy1-xFe1.91 （x = 0. 22,0. 27,0. 3,0. 35 ） alloy rods were prepared through melting with Tb, Dy and Fe elements. Better performanced cast sample was chosen and vacuum-direcfionally solidified to get a material with exceBent magnetostrictive. In order to simulate low vacuum heat treatment experimental environment,the sample was vacuum heat-treated without argon. The magnetostriction of the alloy has been tested. The microstructure and preferred orientation of the alloy have been studied. Studies show that in the low magnetic field, the TbxDy1-xFe1.91 sample with x = 0. 27 gets better magnetostrictive prop- erties than others. In the low magnetic field,the Tb, TbxDy1-xFe1.91 sample with x =0. 3 gets better magnetostrictive properties and excellent ＂jump＂ effect. Different orientations of samples greatly affect its magnetostrictive performance. The larger the value of σ = I111/（ I110 ＋ I112 ＋ I113 ）, the ＂jump＂ effect of the alloy is more obvious in high magnetic fields; The larger the value of 8 = （I110 ＋ I112 ）/（ I111＋ I113 ）, the more obvious ＂jump＂ effect of the alloy in low magnetic fields. Large size phase of rich rare earth produce a significant impact on magnetostrictive. After vacuum directional solidification and heat treatment of better performance TbxDy1-xFe1.91 cast in a simulated low vacuum environment, the rare earth element was burned so much that the magnetostrietive performance of ThDyFe decreased grately and ＂jump＂ effect almost disappeared. RFe2 and RFe3 coupling phase is the main phase in the matrix, the burning loss of rare earth elements leads to variations in chemical composition, resulting in coupling growth with RFe3 phase and RFe2 phase.

关 键 词：TbDyFe 真空实验环境 磁致伸缩 “jump”效应 

分 类 号：TF133[冶金工程—冶金物理化学]