Microstructure and magnetic properties of Nd-Fe-B permanent magnets produced by laser powder bed fusion

被引：38

作者：

Bittner, F. ^{[1
]}

Thielsch, J. ^{[1
]}

Drossel, W. -G. ^{[1
,2
]}

机构：

[1] Fraunhofer Inst Machine Tools & Forming Technol I, Noethnitzer Str 44, D-01187 Dresden, Germany

[2] Tech Univ Chemnitz, D-09107 Chemnitz, Germany

来源：

SCRIPTA MATERIALIA | 2021年 / 201卷

关键词：

Additive manufacturing; Laser powder bed fusion; Nd-Fe-B permanent magnet; Microstructure; Coercivity; COERCIVITY; STABILITY; ADDITIONS; ND2FE14B; ZR;

D O I：

10.1016/j.scriptamat.2021.113921

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Additive manufacturing of Nd-Fe-B is a novel approach for the fabrication of permanent magnets. We present an analysis of the magnetic properties and microstructure of Nd-Fe-B permanent magnets, which were produced by laser powder bed fusion (LPBF). By optimization of processing parameters for the Nd-lean powder coercivity of 921 kA/m (1.16 T), remanence of 0.63 T and maximum energy product of 63 kJ/m(3) are achieved without the addition of further Nd-rich low-melting alloys or any other post treatment. Thereby, remanence and maximum energy product represent the highest reported values for additively manufactured permanent magnets. The impact of area energy density E-A on the magnetic properties is discussed. The isotropic microstructure consists of short Nd2Fe14B dendrites at the melt pool boundaries and globular sub-micron sized grains in the melt pool interior. After LPBF of the Nd-lean powder no evidence of alpha-Fe is found in the microstructure. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：5

共 30 条

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