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RESEARCH ON NEW GIANT MAGNETOSTRICTIVE RARE EARTH-TRANSITION METAL INTERMETALLIC COMPOUNDS, AND CONTROL OF HIGH MAGNETOMECHANICAL COUPLING

新型巨磁致伸缩稀土过渡金属金属间化合物及高磁力耦合控制研究

基本信息

批准号：
03650523
负责人：
ISHIO Shunji
金额：
$ 1.34万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Research work on new giant magnetostrictive materials from a physical view point and a development work to attain high magnetomechanical coupling were carried out.[1] Research on new giant magnetostrictive compounds(1-1) RCo_3 compoundMagnetostriction of RCo_3 at room temperature is -25x10^<-6>, -155x10^<-6>, -65x10^<-6>, 760x10^<-6>, 80x10^<-6> for R=Y, Pr, Sm, Gd, Tb and Dy, respectively. The magnetostriction of TbCo_3 reaches 2680x10^<-6> at 77K, which is comparable to the typical giant magnetostrictive compound TbFe_2.(1-2) Tb(Fe_<1-x>M_x)_2 compoundA substitution of M elements (M=Co, Ni, Mn, Cr, Ti, V) to the Fe site in TbFe_2 causes a reduction of magnetostriction. However it improves a magnetic softness in the case of M=Ti, Cr, Mn and Co.[2] Development of the giant magnetostrictive materials with a high magnetomechanical coupling by forming nanocrystallite and amorphous phase(2-1) Rapidly quenching of TbFe_2 compoundAs a quenching velocity increases from 8m/s to 32m/s, the crys … More talline size decreases from 400A to 250A and the coercive force drops to 9000e. This indicates that a magnetocrystalline anisotropy can be suppressed by a formation of nanocrystalline of giant magnetostrictive compounds similarly to soft magnetic materials. On the other hand, a high magnetoelastic coupling was not attained by an amorphization of Fe_2Tb.(2-2) Rapidly quenching of SmFe_2 compoundMgCu_2 phase is formed in the Sm_<1-x>Fe_x system around x=0.66. The magnetostriction is less than -500x10^<-6> for Sm_<0.34>Fe_<0.66>, but reaches -1100x10^<-6> for Sm_<0.35>(Fe_<0.5>Co_<0.5>)_<0.65>. The magnetic softness was not obtained in a rapidly quenched SmFe system.(2-3) Measurement apparatus for dynamic magnetomechanical couplingThe apparatus is composed of bias magnetic field, ac exciting field, impedance analyzer and personal computer for system control and data analysis. A dynamic magnetomechanical coupling for thin ribbons having L/D more than 15 can be measured in the accuracy within 5%. Less

从物理角度对新型超磁致伸缩材料进行了研究，并开展了实现高磁力耦合的开发工作。[1]新型超磁致伸缩化合物研究（1-1）RCo_3化合物RCo_3在室温下的磁致伸缩系数分别为-25x10^<-6>、-155x10^、<-6>-65x10^<-6>、760x10^<-6>、80x10^<-6>（R=Y、Pr、Sm、Gd、Tb和Dy）。TbCo_3的磁致伸缩系数在77 K时达到2680 × 10 ~ 4<-6>，与典型的超磁致伸缩化合物TbFe_2相当。(1-2)Tb（Fe_<1-x>M_x）_2化合物M元素（M=Co，Ni，Mn，Cr，Ti，V）取代TbFe_2中的Fe位，使磁致伸缩降低。然而，在M=Ti、Cr、Mn和Co的情况下，它改善了磁性软度。[2]通过形成纳米微晶和非晶相开发高磁力耦合的超磁致伸缩材料（2-1）TbFe_2化合物的快速淬火当淬火速度从8 m/s增加到32 m/s时， ...更多信息最大尺寸从400 A下降到250 A，矫顽力下降到9000 e。这表明，磁晶各向异性可以通过类似于软磁材料的超磁致伸缩化合物的纳米晶体的形成来抑制。另一方面，Fe_2Tb的非晶化不能获得高的磁弹性耦合。(2-2)Sm_ Fe_x系在x=0.66附近形成SmFe_2化合物MgCu_2相<1-x>。Sm_（Fe_Co）_的磁致伸缩系数小于-500 × 10 ~（-1）^<-6><0.34>，<0.66>而<-6>Sm_<0.35>（Fe_<0.5>Co）<0.5>_的磁致伸缩系数达到-1100 × 10 ~（-1）^<0.65>。在快速淬火的SmFe系统中没有获得磁性软度。(2-3)动态磁力耦合测量装置由偏置磁场、交流励磁磁场、阻抗分析仪和微机组成，用于系统控制和数据分析。对长径比大于15的薄带进行动态磁力耦合测量，测量精度在5%以内。少