# Regulation of Grain Boundary Structure in NdFeCoB Magnets through Grain Boundary Diffusion of DyAlCu Alloy

https://mdr.nims.go.jp/datasets/24f3dd8d-17c4-4611-95e9-8bd835b92a55

## File

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## Id

24f3dd8d-17c4-4611-95e9-8bd835b92a55

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-25T01:48:43.832126Z

## Updated at

2025-09-11T07:30:41.295459Z

## Published at

2025-09-11T07:20:03.998789Z

## Doi

https://doi.org/10.48505/nims.5665

## First published url



## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection

- id: d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  identifier: https://mdr.nims.go.jp/pid/d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  title: The 28th International Workshop on Rare Earth and Future Permanent Magnets
    and Their Applications (REPM2025)

## Title

- title: Regulation of Grain Boundary Structure in NdFeCoB Magnets through Grain Boundary
    Diffusion of DyAlCu Alloy
  title_type: original
  lang: en

## Description

- description: 'The optimization of grain boundary structure in sintered NdFeCoB magnets
    was studied using the grain boundary diffusion process (GBDP) with Dy70Al20Cu10
    alloy flakes as the diffusion source. These flakes were attached to magnets with
    a nominal composition of Pr7.8Nd23.4Co12FebalAl0.3Cu0.2Zr0.1B1. Magnets with various
    coating thicknesses were labeled as follows: GBD-0 (0 mm), GBD-1 (0.03 mm), GBD-2
    (0.09 mm), and GBD-3 (0.15 mm). Among them, GBD-3 exhibited optimal performance,
    increasing the coercivity from 7.94 to 17.63 kOe, which represented a significant
    enhancement of 122%. And the diffused magnet exhibited a more optimized temperature
    coefficient. Prior to GBDP, Co aggregated at grain boundaries with Nd2Co17 phase.
    After GBDP, microstructural analysis revealed the formation of Dy-rich shells
    with high anisotropy fields around the 2-14-1 phase within the magnet. Additionally,
    Al and Cu were uniformly distributed, which reduced Nd2Co17 content and enhanced
    coercivity. This study shows GBDP with " Heavy Rare Earth-Low Melting Point" alloys
    improves NdFeCoB magnets'' magnetic properties, offering a theoretical basis for
    high-performance, temperature-stable sintered NdFeCoB magnets.'
  description_type: abstract
  lang: en

## Creator

- name: Shengzhi Dong
  role: author
  organization: Central lron & Steel Research Institute, China
- name: Haibo Feng
  role: author
  organization: Central lron & Steel Research Institute, China
- name: Jing Liu
  role: author
  organization: Central lron & Steel Research Institute, China
- name: Jiateng Zhang
  role: author
  organization: Central lron & Steel Research Institute, China
- name: Wei Li
  role: author
  organization: Central lron & Steel Research Institute, China

## Contact agent



## Publisher

organization: National Institute for Materials Science (NIMS)

## Managing organization



## Keyword

- subject: REPM2025
  schema: not_defined
- subject: Grain Boundary Diffusion
  schema: not_defined
- subject: NdFeCoB Magnet
  schema: not_defined
- subject: Nd2Co17
  schema: not_defined
- subject: Coercivity
  schema: not_defined
- subject: Low melting-point alloy
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: REPM2025
start_date: 2025-07-27
end_date: 2025-07-31
identifier: https://www.nims.go.jp/mmu/repm2025/

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## Fileset

- id: d86c34c7-54e6-4436-af57-991705fcbc0a
  filename: REPM2025_P1-11_Dong.pdf
  content_type: application/pdf
  size: 2874438
  md5: '03976c06383c257c0b8e3db9f6cd0e94'

## Thumbnail

fileset_id: d86c34c7-54e6-4436-af57-991705fcbc0a
filename: REPM2025_P1-11_Dong.pdf