Journal ArticleDOI
Effect of post-sinter annealing on the coercivity and microstructure of Nd-Fe-B permanent magnets
TLDR
In this article, the mechanism of the increase in coercivity caused by post-sinter annealing of Nd-Fe-B-based magnets was investigated by high-resolution scanning electron microscopy, transmission electron microscope and atom probe tomography.About:
This article is published in Acta Materialia.The article was published on 2009-03-01. It has received 255 citations till now. The article focuses on the topics: Coercivity & Grain boundary.read more
Citations
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Journal ArticleDOI
Magnetic materials and devices for the 21st century: Stronger, lighter, and more energy efficient
TL;DR: Considering future bottlenecks in raw materials, options for the recycling of rare-earth intermetallics for hard magnets will be discussed and their potential impact on energy efficiency is discussed.
Journal ArticleDOI
Strategy for high-coercivity Nd-Fe-B magnets
TL;DR: The formation of continuous thin layers of a Ndrich amorphous phase surrounding Nd 2 Fe 14 B grains is the key microstructural feature of high-coercivity Nd-Fe 14 B magnets.
Journal ArticleDOI
Current status and recent topics of rare-earth permanent magnets
TL;DR: A review of the current status and future trend in the research of permanent magnets can be found in this article, where the authors present a survey of the magnet manufacturing process and its application in the automotive domain.
Journal ArticleDOI
Grain boundary and interface chemistry of an Nd–Fe–B-based sintered magnet
TL;DR: In this paper, the compositions of grain boundaries (GBs) and other interfaces surrounding Nd 2 Fe 14 B sintered magnets have been investigated by laser-assisted three-dimensional atom probe to understand the mechanism of the coercivity enhancement by post-sinter annealing.
Journal ArticleDOI
Coercivity enhancement of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powders by the diffusion of Nd–Cu eutectic alloys
Hossein Sepehri-Amin,Hossein Sepehri-Amin,Tadakatsu Ohkubo,Takeshi Nishiuchi,Satoshi Hirosawa,Kazuhiro Hono,Kazuhiro Hono +6 more
TL;DR: In this article, the authors reported the coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA/m−1 (19.5 kOe) by the grain boundary diffusion.
References
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Journal ArticleDOI
Improvement of coercivity of sintered NdFeB permanent magnets by heat treatment
TL;DR: In this article, the authors investigated the metallurgical transformations that occur during heat treatment of Nd-based magnets and showed that thin and smooth RE-rich film is associated with the highest coercivity.
Journal ArticleDOI
Field-ion specimen preparation using focused ion-beam milling
D.J. Larson,D T Foord,A. K. Petford-Long,H Liew,Mark G. Blamire,Alfred Cerezo,George Davey Smith +6 more
TL;DR: In this paper, the authors used focused ion-beam milling in either a simple cutting mode or by application of an annular-shaped ion-milling pattern to produce a smaller shank angle and a sharper apex radius.
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Effect of annealing on the microstructure of sintered Nd‐Fe‐B magnets
TL;DR: In this paper, a transmission electron microscopy study of sintered Nd•Fe•B magnets after annealing above 650°C shows the formation of a thin intergranular Nd−rich layer extending to pockets of polycrystalline fcc Nd crystals.
Journal ArticleDOI
Coercivity mechanism of hydrogenation disproportionation desorption recombination processed Nd–Fe–B based magnets
TL;DR: In this paper, the microstructure change of hydrogenation disproportionation desorption recombination processed Nd12.5Fe73Co8B6.5 powders was investigated to understand the mechanism of the coercivity development in the DR process.
Journal ArticleDOI
Transmission electron microscope characterization of cast and hot‐worked R‐Fe‐B:Cu(R=Nd,Pr) permanent magnets
Josef Fidler,Johannes Bernardi +1 more
TL;DR: In this article, the authors show that the reason for the increase of the coercivity is the fact that Cu is mainly dissolved in the intergranular region separating the hard magnetic 2:14:1 grains.