Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets | |
Wu GY; Li HW; Yu DB; Li KS; Yan WL; Yuan C; Sun L; Luo Y; Zhang K(张坤) | |
发表期刊 | JOURNAL OF RARE EARTHS |
2018-03-01 | |
卷号 | 36期号:3页码:281-286 |
ISSN | 1002-0721 |
摘要 | This paper reports crystal structures, magnetic properties and thermal stability of TbCu7-type Sm8.5Fe(85.8-x)Co4.5Zr1.2Nbx (x = 0-1.8) melt-spun compounds and their nitrides, investigated by means of X-ray diffraction, vibrating sample magnetometer, flux meter and transmission electron microscope. It is found that the lattice parameter ratio c/a of TbCu7-type crystal structure increases with Nb substitution, which indicates that the Nb can increase the stability of the metastable phase in the Sm-Fe ribbons. Nb substitution impedes the formation of magnetic soft phase alpha-Fe in which reversed domains initially form during the magnetization reversal process. Meanwhile, Nb substitution refines grains and leads to homogeneous microstructure with augmented grain boundaries. Thus the exchange coupling pining field is enhanced and irreversible domain wall propagation gets suppressed. As a result, the magnetic properties are improved and the irreversible flux loss of magnets is notably decreased. A maximum value 771.7 kA/m of the intrinsic coercivity H-cj is achieved in the 1.2 at% substituted samples. The irreversible flux loss for 2 h exposure at 120 degrees C declines from 8.26% for Nb-free magnets to 6.32% for magnets with 1.2 at% Nb substitution. (C) 2018 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths. |
关键词 | Magnetic Properties Thermal Stability Grain Size Pinning Field Irreversible Flux Loss Rare Earths |
DOI | 10.1016/j.jre.2017.05.008 |
URL | 查看原文 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000427615000009 |
关键词[WOS] | Nanocrystalline Permanent-magnets ; Nitrides ; Alloys ; Coercivity ; Behavior ; Reversal ; Ribbons |
WOS研究方向 | Chemistry, Applied |
WOS类目 | Chemistry |
项目资助者 | National Natural Science Foundation of China [51401028] |
论文分区 | 二类 |
力学所作者排名 | 1 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/77916 |
专题 | 微重力重点实验室 |
通讯作者 | Zhang K(张坤) |
作者单位 | 1.Grirem Adv Mat Co Ltd, Gen Res Inst Nonferrous Met, Natl Engn Res Ctr Rare Earth Mat, Beijing 100088, Peoples R China 2.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Wu GY,Li HW,Yu DB,et al. Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets[J]. JOURNAL OF RARE EARTHS,2018,36,3,:281-286. |
APA | Wu GY.,Li HW.,Yu DB.,Li KS.,Yan WL.,...&Zhang K.(2018).Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets.JOURNAL OF RARE EARTHS,36(3),281-286. |
MLA | Wu GY,et al."Effect of niobium substitution on microstructures and thermal stability of TbCu7-type Sm-Fe-N magnets".JOURNAL OF RARE EARTHS 36.3(2018):281-286. |
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