TY - JOUR
T1 - Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration
AU - Huber, Christian
AU - Sepehri-Amin, Hossein
AU - Goertler, Michael
AU - Groenefeld, Martin
AU - Teliban, Iulian
AU - Hono, Kazuhiro
AU - Suess, Dieter
N1 - Funding Information:
The support from CD-Laboratory AMSEN (financed by the Austrian Federal Ministry of Economy , Family and Youth, the National Foundation for Research, Technology and Development ) is acknowledged. This work was in part supported by JST , Collaborative Research Based on Industrial Demand .
Publisher Copyright:
© 2019 Acta Materialia Inc.
PY - 2019/6/15
Y1 - 2019/6/15
N2 - Laser powder bed fusion is a well-established additive manufacturing method that can be used for the production of net-shaped Nd–Fe–B magnets. However, low coercivity has been one of the drawbacks in the laser powder bed fusion processed Nd–Fe–B magnets. In this work, we have demonstrated that the grain boundary diffusion process using low-melting Nd–Cu, Nd–Al–Ni–Cu, and Nd–Tb–Cu alloys to the selective laser sintered NdFeB magnets can results in a substantial enhancement of coercivity from 0.65 T to 1.5 T. Detailed microstructure investigations clarified that the formation of Nd-rich grain boundary phase, the introduction of Tb-rich shell at the surface of Nd2Fe14B grains, and maintaining the grain size in nano-scale are responsible for the large coercivity enhancement.
AB - Laser powder bed fusion is a well-established additive manufacturing method that can be used for the production of net-shaped Nd–Fe–B magnets. However, low coercivity has been one of the drawbacks in the laser powder bed fusion processed Nd–Fe–B magnets. In this work, we have demonstrated that the grain boundary diffusion process using low-melting Nd–Cu, Nd–Al–Ni–Cu, and Nd–Tb–Cu alloys to the selective laser sintered NdFeB magnets can results in a substantial enhancement of coercivity from 0.65 T to 1.5 T. Detailed microstructure investigations clarified that the formation of Nd-rich grain boundary phase, the introduction of Tb-rich shell at the surface of Nd2Fe14B grains, and maintaining the grain size in nano-scale are responsible for the large coercivity enhancement.
KW - Coercivity
KW - Grain boundary
KW - NdFeB
KW - Selective laser sintering
KW - additive manufacturing
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U2 - 10.1016/j.actamat.2019.04.037
DO - 10.1016/j.actamat.2019.04.037
M3 - Article
AN - SCOPUS:85064908653
SN - 1359-6454
VL - 172
SP - 66
EP - 71
JO - Acta Materialia
JF - Acta Materialia
ER -