非晶晶化过程中Nd2Fe14B 相和α-Fe 相的析出与长大及其磁性能

doi:10.3969/j.issn.1007-2861.2015.04.002

上海大学学报(自然科学版) ›› 2016, Vol. 22 ›› Issue (6): 710-718.doi: 10.3969/j.issn.1007-2861.2015.04.002

非晶晶化过程中Nd₂Fe₁₄B 相和α-Fe 相的析出与长大及其磁性能

薛允1, 侯雪玲1, 韩宁2, 卢倩倩1, 徐晖1

1. 上海大学材料科学与工程学院, 上海 200444;
2. 上海工程技术大学材料科学与工程学院, 上海 201620

收稿日期:2015-09-01 出版日期:2016-12-30 发布日期:2016-12-30
通讯作者: 侯雪玲(1965—), 女, 副研究员, 博士, 研究方向为磁制冷材料及纳米晶磁性材料等. E-mail: xlhou@staff.shu.edu.cn
作者简介:侯雪玲(1965—), 女, 副研究员, 博士, 研究方向为磁制冷材料及纳米晶磁性材料等. E-mail: xlhou@staff.shu.edu.cn
基金资助:
国家自然科学基金资助项目(U1531120); 上海市自然科学基金资助项目(13ZR1415300); 上海市教委重点科研创新基金资助项目(12ZZ085)

Precipitation and growth of Nd₂Fe₁₄B/α-Fe during amorphous crystallized process and its magnetic properties

XUE Yun1, HOU Xueling1, HAN Ning2, LU Qianqian1, XU Hui1

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Received:2015-09-01 Online:2016-12-30 Published:2016-12-30

摘要/Abstract

摘要：

利用X射线衍射(X-ray diffraction, XRD)分析仪、振动样品磁强计(vibrating sample magnetometer, VSM)和差示扫描量热仪(differential scanning calorimeter, DSC), 研究了非晶Nd_9.5Fe₇₆Co₅Ti₃B_6.5 合金条带晶化过程中Nd₂Fe₁₄B/α-Fe 析出相的相结构及其磁性能的变化. 结果表明, 在晶化过程中Nd₂Fe₁₄B 相和α-Fe 相分别在600, 680 ℃ 退火时析出.随着退火温度的升高, α-Fe 相的晶粒比Nd₂Fe₁₄B 相长大更明显: 当温度由690 ℃升高到700 ℃时, α-Fe相及Nd₂Fe₁₄B相的晶粒尺寸分别由22.4, 32.8 nm长大到33.3, 39.8 nm. 在690 ℃退火时, 硬磁相Nd₂Fe₁₄B 和软磁相α-Fe之间具有较强的交换耦合作用, 其晶粒尺寸分别为32.8, 22.4 nm. 此时的合金具有最佳的综合磁性能: 剩磁强度B_r=0.88 T, 矫顽力H_ci= 523.76 kA/m, 最大磁能积(BH)_max=100.01 kJ/m³.

关键词: NdFeB , 磁性能 , 交换耦合, 纳米双相 , 晶化

Abstract:

The crystal structure, magnetic properties of the Nd_9.5Fe₇₆Co₅Ti₃B_6.5 amorphous alloys annealed at different temperatures were investigated by X-ray diffraction(XRD), vibrating sample magnetometer (VSM), and differential scanning calorimeter (DSC). The results indicated that the Nd₂Fe₁₄B phase was precipitated prior to that of α-Fe phase from the amorphous matrix. Nd₂Fe₁₄B phase and α-Fe phase were precipitated at 600 and 680 ℃, respectively. α-Fe phase grain growed up more obviously than Nd₂Fe₁₄B phase with increasing annealing temperature. The grain sizes of α-Fe phase and Nd₂Fe₁₄B phase growed from 22.4 and 32.8 nm to 33.3 and 39.8 nm when they annealed at 690 to 700 ℃. When annealing at 690 ℃, there were strong exchange coupling effects between hard magnetic phase Nd₂Fe₁₄B with 32.8 nm and soft magnetic phase α-Fe with 22.4 nm. MeanwhileNd_9.5Fe₇₆Co₅Ti₃B_6.5 alloy obtained the best magnetic properties with B_r =0.88 T, H_ci =523.76 kA/m, and (BH)_max=100.01 kJ/m³.

Key words: exchange coupling, magnetic property , nanocomposites , NdFeB , crystallization

薛允1, 侯雪玲1, 韩宁2, 卢倩倩1, 徐晖1. 非晶晶化过程中Nd₂Fe₁₄B 相和α-Fe 相的析出与长大及其磁性能[J]. 上海大学学报(自然科学版), 2016, 22(6): 710-718.

XUE Yun1, HOU Xueling1, HAN Ning2, LU Qianqian1, XU Hui1. Precipitation and growth of Nd₂Fe₁₄B/α-Fe during amorphous crystallized process and its magnetic properties[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(6): 710-718.

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非晶晶化过程中Nd₂Fe₁₄B 相和α-Fe 相的析出与长大及其磁性能

Precipitation and growth of Nd₂Fe₁₄B/α-Fe during amorphous crystallized process and its magnetic properties

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