Journal ArticleDOI
High-coercivity ultrafine-grained anisotropic Nd–Fe–B magnets processed by hot deformation and the Nd–Cu grain boundary diffusion process
Hossein Sepehri-Amin,Tadakatsu Ohkubo,S. Nagashima,Masao Yano,Tetsuya Shoji,Akira Kato,Thomas Schrefl,Kazuhiro Hono +7 more
Reads0
Chats0
TLDR
In this article, the grain boundary diffusion process using an Nd70Cu30 eutectic alloy has been applied to hot-deformed anisotropic Nd-Fe-B magnets, resulting in a substantial enhancement of coercivity, at the expense of remanence.About:
This article is published in Acta Materialia.The article was published on 2013-10-01. It has received 246 citations till now. The article focuses on the topics: Coercivity & Grain boundary diffusion coefficient.read more
Citations
More filters
Journal ArticleDOI
Perspectives for high-performance permanent magnets: applications, coercivity, and new materials*
Journal ArticleDOI
Coercivity Enhancement of Hot-deformed Nd-Fe-B Magnets by the Eutectic Grain Boundary Diffusion Process
Lihua Liu,Lihua Liu,Hossein Sepehri-Amin,Tadakatsu Ohkubo,Masao Yano,Akira Kato,Tomoyuki Shoji,Kazuhiro Hono,Kazuhiro Hono +8 more
TL;DR: In this paper, Nd-M alloys with compositions close to eutectic points were investigated as diffusion sources for the grain boundary diffusion process to hot-deformed nd-Fe-B magnets.
Journal ArticleDOI
LaBonte's method revisited: An effective steepest descent method for micromagnetic energy minimization
TL;DR: In this article, a steepest descent energy minimization scheme for micromagnetic magnetics is presented, which searches on a curve that lies on the sphere which keeps the magnitude of the magnetization vector constant.
Journal ArticleDOI
Grain-size dependent demagnetizing factors in permanent magnets
Simon Bance,Bernhard Seebacher,Thomas Schrefl,Lukas Exl,Michael Winklhofer,Michael Winklhofer,Gino Hrkac,Gergely T. Zimanyi,Tetsuya Shoji,Masao Yano,Noritsugu Sakuma,M. Ito,Akira Kato,Akira Manabe +13 more
TL;DR: The coercive field of permanent magnets decreases with increasing grain size as mentioned in this paper, which is explained by a size dependent demagnetizing factor, which ranges from 0.2 to 1.22 for a grain size of 8300nm.
Journal ArticleDOI
Coercivity and its thermal stability of Nd–Fe–B hot-deformed magnets enhanced by the eutectic grain boundary diffusion process
Jiangnan Li,Lihua Liu,Lihua Liu,Hossein Sepehri-Amin,Xin Tang,Tadakatsu Ohkubo,Noritsugu Sakuma,Tomoyuki Shoji,Akira Kato,Thomas Schrefl,Kazuhiro Hono,Kazuhiro Hono +11 more
TL;DR: In this article, the authors applied the eutectic grain boundary diffusion process to Nd Fe B hot-deformed magnet using Nd60Tb20Cu20 alloy, which resulted in a large coercivity enhancement from 0.87
References
More filters
Journal ArticleDOI
XXV. Zur Frage der Geschwindigkeit des Wachsthums und der Auflösung der Krystallflächen
TL;DR: In der krystallographischen Literatur der letzten Zeit erscheinen mehr und mehr Arbeiten, welche dem gegenseitigen Verhältnisse des Krystalles and des Mediums, in welchem er sich bildet, gewidmet sind.
Journal ArticleDOI
Some Theorems on the Free Energies of Crystal Surfaces
TL;DR: In this article, the Wulff construction for the equilibrium shape of a small particle and the relations between atomic models of crystal surfaces and the surface free energy function used in this construction are 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
Analysis of the magnetic hardening mechanism in RE-FeB permanent magnets
TL;DR: In this article, a detailed analysis of the temperature dependence of H c is given on the basis of the predictions of micromagnetic theories for pinning and nucleation mechanisms, and it is shown that the nucleation theory leads to a coherent interpretation of all relevant properties of Hc than the pinning theory if the effects of misaligned grains, local stray fields and reduced anisotropies in grain boundaries are taken into account.
Journal ArticleDOI
Hot‐pressed neodymium‐iron‐boron magnets
TL;DR: In this paper, a new method is described which produces fully dense, well aligned Nd•Fe•B magnets from rapidly quenched ribbons, achieved by hot pressing at ∼15 kpsi in argon at 700 °C, and a second hot press in a larger die cavity to allow deformation transverse to the press direction (die upsetting).