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Title: Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets

Abstract

The low temperature grain boundary diffusion process using RE{sub 70}Cu{sub 30} (RE = Pr, Nd) eutectic alloy powders was applied to sintered and hot-deformed Nd-Fe-B bulk magnets. Although only marginal coercivity increase was observed in sintered magnets, a substantial enhancement in coercivity was observed when the process was applied to hot-deformed anisotropic bulk magnets. Using Pr{sub 70}Cu{sub 30} eutectic alloy as a diffusion source, the coercivity was enhanced from 1.65 T to 2.56 T. The hot-deformed sample expanded along c-axis direction only after the diffusion process as RE rich intergranular layers parallel to the broad surface of the Nd{sub 2}Fe{sub 14}B are thickened in the c-axis direction.

Authors:
;  [1]; ;  [1]; ;  [2]
  1. Elements Strategy Initiative Center for Magnetic Materials, National Institute for Materials Science, Tsukuba 305-0047 (Japan)
  2. Daido Steel Co., LTD, Nagoya 457-8545 (Japan)
Publication Date:
OSTI Identifier:
22273727
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANISOTROPY; COERCIVE FORCE; COPPER ALLOYS; DIFFUSION; EUTECTICS; GRAIN BOUNDARIES; IRON BORIDES; LAYERS; MAGNETIC MATERIALS; MAGNETS; NEODYMIUM COMPOUNDS; POWDERS; PRASEODYMIUM ALLOYS; PRASEODYMIUM COMPOUNDS; SINTERING; SURFACES; TEMPERATURE DEPENDENCE

Citation Formats

Akiya, T., E-mail: akiya.takahiro@nims.go.jp, Sepehri-Amin, H., Ohkubo, T., Liu, J., Hono, K., Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Hioki, K., and Hattori, A. Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets. United States: N. p., 2014. Web. doi:10.1063/1.4869062.
Akiya, T., E-mail: akiya.takahiro@nims.go.jp, Sepehri-Amin, H., Ohkubo, T., Liu, J., Hono, K., Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Hioki, K., & Hattori, A. Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets. United States. https://doi.org/10.1063/1.4869062
Akiya, T., E-mail: akiya.takahiro@nims.go.jp, Sepehri-Amin, H., Ohkubo, T., Liu, J., Hono, K., Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Hioki, K., and Hattori, A. 2014. "Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets". United States. https://doi.org/10.1063/1.4869062.
@article{osti_22273727,
title = {Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets},
author = {Akiya, T., E-mail: akiya.takahiro@nims.go.jp and Sepehri-Amin, H. and Ohkubo, T. and Liu, J. and Hono, K. and Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577 and Hioki, K. and Hattori, A.},
abstractNote = {The low temperature grain boundary diffusion process using RE{sub 70}Cu{sub 30} (RE = Pr, Nd) eutectic alloy powders was applied to sintered and hot-deformed Nd-Fe-B bulk magnets. Although only marginal coercivity increase was observed in sintered magnets, a substantial enhancement in coercivity was observed when the process was applied to hot-deformed anisotropic bulk magnets. Using Pr{sub 70}Cu{sub 30} eutectic alloy as a diffusion source, the coercivity was enhanced from 1.65 T to 2.56 T. The hot-deformed sample expanded along c-axis direction only after the diffusion process as RE rich intergranular layers parallel to the broad surface of the Nd{sub 2}Fe{sub 14}B are thickened in the c-axis direction.},
doi = {10.1063/1.4869062},
url = {https://www.osti.gov/biblio/22273727}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 115,
place = {United States},
year = {Wed May 07 00:00:00 EDT 2014},
month = {Wed May 07 00:00:00 EDT 2014}
}