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
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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
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Analysis on deformation and texture formation mechanism of hot-deformed Nd-Fe-B magnets based on heterogeneous structure evolution
Yuyang Tang,Yuqing Li,Xiaochang Xu,Ming Yue,Weiqiang Liu,Hongguo Zhang,Hongguo Zhang,Qingmei Lu,Qingmei Lu,Weixing Xia +9 more
TL;DR: In this article, microstructure, micromagnetic structure, texture, together with magnetic properties of the hot-deformed (HD) Nd-Fe-B magnets were systematically studied to understand the deformation process and the formation mechanism of c-axis texture.
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Effects of hot pressing temperature on the alignment and phase composition of hot-deformed nanocrystalline Nd-Fe-B magnets
TL;DR: In this paper, the magnetic properties, alignment and phase composition of nanocrystalline Nd-Fe-B magnets at 830°C employing different hot-pressed precursors fabricated at various hot pressing (HP) temperatures were investigated.
Journal ArticleDOI
Statistical and analytical approaches to finite-temperature magnetic properties of the compound Sm Fe 12
TL;DR: In this article, the magnetic properties of transition-metal compounds are investigated by using a spin model, where magnetic moments, crystal-field (CF) parameters, and exchange fields at 0 K are determined by first-principles calculations.
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Effect of Heat Treatment Time on Dy-Cu Alloy Diffusion Process in Dy-Containing Commercial Nd-Fe-B Sintered Magnets
TL;DR: In this paper, the effect of heat treatment time on the microstructure and magnetic properties of a sintered Nd-Fe-B magnet was investigated in detail, and it was shown that when the heat treatment was more than 2h, the diffusion path of Dy from the Dy-rich shell phase into the Nd2Fe14B grains was revealed, which brought on the decrease in both the depth of visible core-shell structure and the coercivity of Nd−Fe−B magnet.
Journal ArticleDOI
Temperature stability of coercivity in mischmetal-Fe-Co-B melt-spun ribbons
Rui Li,Hongrui Zhang,Yao Liu,Shulan Zuo,Jie-Fu Xiong,Wen-Liang Zuo,T. Y. Zhao,Fengxia Hu,Jirong Sun,Bao-gen Shen +9 more
TL;DR: In this article, the relationship between β and the temperature stabilities of magnetocrystalline anisotropy field (H a ) and saturation magnetization (M s ) as well as the microstructure is discussed.
References
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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.
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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.
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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.
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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.
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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).