超磁致伸缩材料Tb_（0．27）Fe_（2－x）的超声学研究  

The Ultrasonic Studies of Isotropic Giant Magnetostrictive Material Tb_(0.27)Dy_(0.73)Fe_(2-x)

作　　者：周佩珍[1] 沈军[1] 徐永晨[1] 郑洪[1] 蒋志红[1] 

机构地区：[1]同济大学玻耳固体物理研究所,中国科学院上海冶金研究所

出　　处：《功能材料》1994年第2期165-168,共4页Journal of Functional Materials

摘　　要：用超声脉冲回波重迭法测量了超磁致伸缩材料Ｔｂ＿（０．２７）Ｄｙ＿（０．７３）Ｆｅ＿（２－ｘ）系列样品在不同磁场下的超声波速度，给出了该系列样品的弹性常数随磁场的变化情况，并对实验结果作了初步的解释和探讨。The longitudinal and transverse ultra-sonic wave velocities for the isotropic giant magne-tostrictive material Tb_(0.27)Dy_(0.73)Fe_(2-x)under differentmagnetic fields were measured by the ultrasonicpulse echo overlap method in fixed carrier frequencyof 5 MHz.The values of the elastic constants C_(11),C_(12),C_(44) for Tb_(0.27)Dy_(0.73)Fe_(2-x) in different magneticfields are calculated from the sound velocities.Theresults show that C44 does not change as the magnetic field H varied.But during magnetization of the material the elastic constancc C_(11) decrtases first asthe magnetic field H is lower,then it almost keepsunchange within certain H region which is determined by the different iron composition in material.When the field H continuously increase C_(11) goes upsharply and then falls down.From relation of C_(11)vs.Hwe may predict that there are more than onephysical mechanism during rnagnetization process ofisotropic giant magnetostrictive materials.

关 键 词：磁致伸缩 声速 弹性 超声学 压磁材料 TbDyFe 

分 类 号：TB39[一般工业技术—材料科学与工程] TG132.27[金属学及工艺—合金]