| 超磁致伸缩材料Tb_（0．27）Fe_（2－x）的超声学研究 |
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| 引用本文： | 周佩珍,沈军,徐永晨,郑洪,蒋志红. 超磁致伸缩材料Tb_（0．27）Fe_（2－x）的超声学研究[J]. 功能材料, 1994, 0(2) |
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| 作者姓名： | 周佩珍 沈军 徐永晨 郑洪 蒋志红 |
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| 作者单位： | 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 |
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| 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。
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| 关 键 词： | 磁致伸缩，声速，弹性常数 |
The Ultrasonic Studies of Isotropic Giant Magnetostrictive Material Tb_(0.27)Dy_(0.73)Fe_(2-x) |
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| Zhou Peizhen,Shen Jun,Xu Yongchen,Zheng Hong,Jiang Zhihong. The Ultrasonic Studies of Isotropic Giant Magnetostrictive Material Tb_(0.27)Dy_(0.73)Fe_(2-x)[J]. Journal of Functional Materials, 1994, 0(2) |
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| Authors: | Zhou Peizhen Shen Jun Xu Yongchen Zheng Hong Jiang Zhihong |
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| Abstract: | 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. |
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| Keywords: | magnetostriction sound velocity dastic constance. |
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