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

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] ; ;  [3]
  1. Elements Strategy Initiative Center for Magnetic Materials, National Institute for Materials Science, Tsukuba 305-0047 (Japan)
  2. (Japan)
  3. Daido Steel Co., LTD, Nagoya 457-8545 (Japan)
Publication Date:
OSTI Identifier:
22273727
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; 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)
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