Tb_(0.3)(Dy_(1-x)Pr_x)_(0.7)Fe_(1.96)(0≤x≤0.6)化合物的结构、磁化强度和磁致伸缩性能  

Microstructure,Magnetization and Magnetostriction of Tb_(0.3)( Dy_(1- x)Pr_x)_(0.7)Fe_(1.96)( 0≤x≤0.6) Compounds

作　　者：张绍强[1,2] 张茂才[3] 乔祎[3] 刘敏霞[1] 

机构地区：[1]东莞理工学院电子工程学院,广东东莞523808 [2]华南理工大学材料科学与工程学院,广东广州510640 [3]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属》2014年第5期768-773,共6页Chinese Journal of Rare Metals

基　　金：国家科技部863计划项目(2011AA03A404);国家自然科学基金项目(11047150);东莞市科技计划项目(2011108102025);东莞理工学院科研计划项目(2010ZQ06)资助

摘　　要：分别利用电弧炉法和籽晶引导生长的区熔法制备了Tb0.3(Dy1-xPrx)0.7Fe1.96(0≤x≤0.6)化合物的纽扣锭样品和定向凝固棒状样品。对于纽扣锭样品,利用X射线衍射(XRD)测量样品的结构,带能谱分析功能的电子扫描显微电镜(SEM-EDS)分析其物相组成,振动样品磁强计(VSM)测试其磁化强度σ。对于定向凝固样品,利用XRD测量其部分样品取向,标准电阻应变计测试样品在低场下的磁致伸缩性能λ。测试结果表明,随着Pr元素的添加,化合物的结构发生了变化。当x<0.3,化合物的主相为REFe2相和少量富稀土相。当x=0.3时,REFe3相开始出现。至x=0.6时,REFe3相成为化合物的主相。化合物的磁化强度则从x=0.1时的71.28 A·m2·kg-1,逐步下降到x=0.6时的13.47 A·m2·kg-1,分析认为是组成化合物的各物相的比例发生变化及物相的磁学性质不同所导致的。定向凝固样品的取向随着Pr含量增加而发生变化,表明TbDyPrFe化合物的定向凝固工艺需要根据具体的Pr含量而进行制定。添加了Pr元素后,化合物仍然具有较大的磁致伸缩性能。在2 MPa压力、80 kA·m-1磁场下,x=0.1的样品,λ值达到483.2×10-6。而随着Pr元素的进一步添加会引起化合物晶格常数与物相组成的变化,导致样品的λ值发生下降。Tb0. 3（ Dy1- xPrx）0. 7Fe1. 96（ 0≤x≤0.6） compound ingots and directionally solidified rod-shape samples were prepared by arc melting furnace and zone melting method with the guidance of seeds,respectively. For the ingot samples,the microstructure,composition distribution and magnetization（ σ） were characterized by X-ray diffraction（ XRD）,scanning electron microscopy-energy dispersive spectroscopy（ SEM-EDS）,vibrating sample magnetometer（ VSM）,respectively. While for the directionally solidified samples,the orientations and magnetostriction（ λ） at low magnetic field were measured by XRD and standard resistance strain gauge method,respectively. The results revealed that the microstructure of compounds changed with Pr element addition. When x 0. 3,the ma-trix of samples was mainly REFe2 phase with few rare earth-rich phases. When x = 0. 3,non-cubic phase REFe3 appeared. When x =0. 6,REFe3 phase became the matrix of the compound. The magnetization of samples decreased gradually from 71. 28 A·m^2·kg^-1or x= 0. 1 to 13. 47 A·m^2·kg^-1or x = 0. 6 due to the difference of phase composition content and their magnetic properties in the compounds. The orientation of rod-shape samples changed as Pr content increased,indicating that the directional solidification parameters of TbDyPrFe compounds should be adjusted according to the Pr content. The result of magnetostriction indicated that the samples remained excellent performance with the addition of Pr element. At a compressive stress of 2 MPa and a magnetic field of H = 80 kA·m^- 1,the λ reached 483.2 ×10^- 6for x = 0. 1. However,with the increase of Pr content,the λ of samples decreased due to the change of lattice constant and phase composition of compounds.

关 键 词：TbDyPrFe化合物 定向凝固 物相结构 磁化强度 磁致伸缩 

分 类 号：TB34[一般工业技术—材料科学与工程]