强磁场热处理对TbFe2和Tb0.27Dy0.73Fe1.95合金晶体取向、微观形貌和磁致伸缩性能的影响

doi:10.3724/SP.J.1037.2013.00289

金属学报

2013, Vol. 49

Issue (9): 1148-1152 DOI: 10.3724/SP.J.1037.2013.00289

论文

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强磁场热处理对TbFe₂和Tb_0.27Dy_0.73Fe_1.95合金晶体取向、微观形貌和磁致伸缩性能的影响

刘印,刘铁,王强,王慧敏,王丽,赫冀成

东北大学材料电磁过程研究教育部重点实验室, 沈阳 110819

EFFECT OF HIGH MAGNETIC FIELD ON CRYSTAL ORIENTATION, MORPHOLOGY AND MAGNETOSTRICTION OF TbFe₂ AND Tb_0.27Dy_0.73Fe_1.95 ALLOYS DURING HEAT TREATMENT PROCESS

LIU Yin, LIU Tie, WANG Qiang, WANG Huimin, WANG Li, HE Jicheng

Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University,Shenyang 110819

引用本文:

刘印,刘铁,王强,王慧敏,王丽,赫冀成. 强磁场热处理对TbFe₂和Tb_0.27Dy_0.73Fe_1.95合金晶体取向、微观形貌和磁致伸缩性能的影响[J]. 金属学报, 2013, 49(9): 1148-1152.
LIU Yin, LIU Tie, WANG Qiang, WANG Huimin, WANG Li, HE Jicheng. EFFECT OF HIGH MAGNETIC FIELD ON CRYSTAL ORIENTATION, MORPHOLOGY AND MAGNETOSTRICTION OF TbFe₂ AND Tb_0.27Dy_0.73Fe_1.95 ALLOYS DURING HEAT TREATMENT PROCESS[J]. Acta Metall Sin, 2013, 49(9): 1148-1152.

全文: PDF(1007 KB)

摘要:

研究了在11.5 T的磁场强度下, 强磁场热处理对稀土－铁基合金TbFe₂和Tb_0.27Dy_0.73Fe_1.95的晶体取向、微观形貌及其磁致伸缩性能的影响. 结果表明, 强磁场退火不会改变合金的择优取向,但是取向度较退火前有显著提高. 2种样品的相组成均无变化,但11.5 T热处理使TbFe₂样品中的富稀土相明显减少, 磁性相面积增大.强磁场热处理后, Tb_0.27Dy_0.73Fe_1.95合金的磁致伸缩系数增幅较小,而TbFe₂合金的磁致伸缩系数比无磁场样品有较大提高.

关键词 ：强磁场热处理, 稀土－铁基合金, 磁致伸缩, 择优取向

Abstract：

The rare－earth giant magnetostrictive materials are one kind of the most important functional materials now. The rare－earth giant magnetostrictive materials of TbFe₂ and Tb_0.27Dy_0.73Fe_1.95(R－Fe) alloys were firstly used in sonar system in military. Now, the applications of these two alloys have been developed widely in both industry and civil fields, such as magnetomechanical transducers, actuators, adaptive vibration control systems, and so on. The TbFe₂ and Tb_0.27Dy_0.73Fe_1.95 alloys both have the C15－type cubic Laves phase structure, which has strong magnetic anisotropy. This causes that the alloys exhibit different magnetostrictive properties along different crystal orientations. So, the preparation of high orientation degree magnetostrictive materials has a great of importance. In this work, it is predicted that the magnetostricive property of these two alloys can be enhanced with high magnetic field during heat treatment around their Curie and eutectic points. Therefore, a high magnetic field up to 11.5 T was imposed on these two kinds of R－Fe alloys during heat treatment at different temperatures in the experiments. Then the effects of high magnetic field on the crystal orientation, morphology and magnetostriction were analyzed in detail by XRD, metallographic microscope, and static resistance strain gauge. Also, the relationship between structure and property is discussed. The results showed that high magnetic field didn't change the orientation of the R－Fe alloys, but the orientation degree had a great improvement after heat treatment. The phase composition of the two alloys had no change. However, the heat treatment with a magnetic field up to 11.5 T distinctly reduced the rare－earth phase of TbFe₂ and obviously increased the magnetic phase. In addition, the magnetostrictive property of TbFe₂ alloy increased after the heat treatment with high magnetic field. But for Tb_0.27Dy_0.73Fe_1.95 alloy, the magnetostriction was not obviously enhanced. The reason for the improvement of the magnetostriction is that the Zeeman energy caused by high magnetic field increased the total Gibbs free energy of the system, which made the random orientation in crystals orient along the <113> direction, and enhanced the magnetostriction of the R－Fe alloys.

Key words： high magnetic field heat treatment R－Fe alloy magnetostriction preferred orientation

收稿日期: 2013-05-28

基金资助:

国家自然科学基金项目51006020, 51174056, 国家重点基础研究发展计划项目2011CB612206和中央高校基本科研业务费项目N120409001, N120509001资助

作者简介: 刘印, 男, 1982年生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00289 或 https://www.ams.org.cn/CN/Y2013/V49/I9/1148

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