Structure and magnetic properties of TbCu7-type melt-spun Sm–Fe–B alloys
来源期刊：Rare Metals2019年第2期
论文作者：Chuan-Jiang Zheng Yang Luo Dun-Bo Yu Wen-Long Yan Hong-Wei Li Yong-Jun Mao Shuo Lu Ning-Tao Quan
文章页码：151 - 156
摘 要：The melt-spun SmFe12Bx（x = 0, 0.50, 0.75,1.00, 1.25 and 1.50） ribbons were prepared at 40 m·s-1,and their structure and magnetic properties were studied by powder X-ray diffraction（XRD）, vibrating sample magnetometer（VSM） and transmission electron microscopy（TEM）. XRD results indicate that SmFe12Bx alloys with 0.50 ≤ x ≤ 1.00 are composed of single-phase TbCu7-type structure. Moreover, it is found that the boron addition can inhibit the emergence of soft magnetic phase a-Fe and result in the increase in the axial ratio c/a. After annealing at 650 ℃ for 0.5 h, the metastable phase TbCu7 initially decomposes into the stable phase Sm2Fe14B(Nd2Fe14B-type) and a-Fe. The value of magnetic moment per Fe atom increases slightly from 1.75 uB for boron-free sample to 1.80 uB for the x = 0.75 sample and then decreases again.In addition, the best magnetic properties of maximum energy product [（BH）max] of 14.56 kJ·m-3, coercivity(Hcj)of 172.6 kA·m-1 and remanence（Br） of 0.45 T are obtained for the SmFe12B1.00 alloy. Based on transmission electron microscopy（TEM） results, the average size of grains is around 197 nm for B-free sample and decreases to 95 nm for x = 1.00 sample, indicating that the addition of boron can refine grains.
Chuan-Jiang Zheng1,2，Yang Luo1,2，Dun-Bo Yu1,2，Wen-Long Yan1,2，Hong-Wei Li1,2，Yong-Jun Mao1,2，Shuo Lu1,2，Ning-Tao Quan1,2
1. National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals2. Grirem Advanced Materials Co. Ltd.
摘 要：The melt-spun SmFe12Bx（x = 0, 0.50, 0.75,1.00, 1.25 and 1.50） ribbons were prepared at 40 m·s-1,and their structure and magnetic properties were studied by powder X-ray diffraction（XRD）, vibrating sample magnetometer（VSM） and transmission electron microscopy（TEM）. XRD results indicate that SmFe12Bx alloys with 0.50 ≤ x ≤ 1.00 are composed of single-phase TbCu7-type structure. Moreover, it is found that the boron addition can inhibit the emergence of soft magnetic phase a-Fe and result in the increase in the axial ratio c/a. After annealing at 650 ℃ for 0.5 h, the metastable phase TbCu7 initially decomposes into the stable phase Sm2Fe14B(Nd2Fe14B-type) and a-Fe. The value of magnetic moment per Fe atom increases slightly from 1.75 uB for boron-free sample to 1.80 uB for the x = 0.75 sample and then decreases again.In addition, the best magnetic properties of maximum energy product [（BH）max] of 14.56 kJ·m-3, coercivity(Hcj)of 172.6 kA·m-1 and remanence（Br） of 0.45 T are obtained for the SmFe12B1.00 alloy. Based on transmission electron microscopy（TEM） results, the average size of grains is around 197 nm for B-free sample and decreases to 95 nm for x = 1.00 sample, indicating that the addition of boron can refine grains.
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