Magnetostriction,composition and microstructure of Tb0.29（Dy（1-x）Prx）0.71Fe1.97 alloys with heat treatment
来源期刊：JOURNAL OF RARE EARTHS2013年第6期
论文作者：张绍强 张茂才 乔祎 刘敏霞 王红成 徐永钊
文章页码：577 - 581
摘 要：Tb0.29（Dy1-xPrx）0.71Fe1.97 （x=0,0.1,0.2 and 0.3） alloys prepared by the directional solidification method were treated at 1073,1123,1173,1223 and 1273 K for 4 h for homogenization,respectively.The magnetostriction,micro-morphology and composition distribution were studied by the standard resistance strain gauge technique,optical microscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy （SEM-EDS）.The results indicated that heat treatment could make the microstructure of alloys homogeneous effectively and improve the magnetostriction significantly.The optimum temperature was 1223 K.Compared to the as-cast ones,the increase amplitudes of magnetostriction of the corresponding samples were 39.5%,64.9%,95.3% and 50.8% when x=0,0.1,0.2 and 0.3,respectively at the compressive stress of 2 MPa and a magnetic field of 80 kA/m.The compressive stress could also improve the magnetostriction.However,further Pr element addition and over high heat treatment temperature would lead to the excessive decomposition of PrFe2 and destroy the homogeneity,resulting in the decline of magnetostriction of alloys.
张绍强1,2，张茂才3，乔祎3，刘敏霞2，王红成2，徐永钊2
1. College of Materials Science and Engineering,South China University of Technology2. Department of Electronic Engineering,Dongguan University of Technology3. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing
摘 要：Tb0.29（Dy1-xPrx）0.71Fe1.97 （x=0,0.1,0.2 and 0.3） alloys prepared by the directional solidification method were treated at 1073,1123,1173,1223 and 1273 K for 4 h for homogenization,respectively.The magnetostriction,micro-morphology and composition distribution were studied by the standard resistance strain gauge technique,optical microscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy （SEM-EDS）.The results indicated that heat treatment could make the microstructure of alloys homogeneous effectively and improve the magnetostriction significantly.The optimum temperature was 1223 K.Compared to the as-cast ones,the increase amplitudes of magnetostriction of the corresponding samples were 39.5%,64.9%,95.3% and 50.8% when x=0,0.1,0.2 and 0.3,respectively at the compressive stress of 2 MPa and a magnetic field of 80 kA/m.The compressive stress could also improve the magnetostriction.However,further Pr element addition and over high heat treatment temperature would lead to the excessive decomposition of PrFe2 and destroy the homogeneity,resulting in the decline of magnetostriction of alloys.
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