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Hossein Sepehri-Amin

Researcher at National Institute for Materials Science

Publications -  155
Citations -  6076

Hossein Sepehri-Amin is an academic researcher from National Institute for Materials Science. The author has contributed to research in topics: Coercivity & Grain boundary. The author has an hindex of 32, co-authored 130 publications receiving 4286 citations. Previous affiliations of Hossein Sepehri-Amin include University of Tsukuba & Tohoku University.

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Strategy for high-coercivity Nd-Fe-B magnets

Kazuhiro Hono, +1 more
- 01 Sep 2012 - 
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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Grain boundary and interface chemistry of an Nd–Fe–B-based sintered magnet

Hossein Sepehri-Amin, +3 more
- 01 Feb 2012 - 
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.
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High-coercivity ultrafine-grained anisotropic Nd–Fe–B magnets processed by hot deformation and the Nd–Cu grain boundary diffusion process

Hossein Sepehri-Amin, +7 more
- 01 Oct 2013 - 
TL;DR: 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.
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The mechanism of coercivity enhancement by the grain boundary diffusion process of Nd–Fe–B sintered magnets

Hossein Sepehri-Amin, +2 more
- 01 Apr 2013 - 
TL;DR: In this article, the mechanism of the coercivity enhancement by the grain boundary diffusion process (GBDP) using Dy vapor based on detailed microstructural characterizations was discussed, and it was shown that both the (Nd,Dy) 2 Fe 14 B shell and the Nd-rich GB phase layer are required micro-structural features for the GBDP.
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Coercivity enhancement of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powders by the diffusion of Nd–Cu eutectic alloys

Hossein Sepehri-Amin, +6 more
- 01 Nov 2010 - 
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.