# Process parameters and magnetic properties (coercivity, remanence, squareness, maximum energy product) of data-driven fabrication of Nd-Fe-B anisotropic magnets by direct hot extrusion.

https://mdr.nims.go.jp/datasets/cfb086fc-aa63-4650-a746-608993018834

## File

- [DataSummary_Extrusion_Manuscript_20210728.xlsx](https://mdr.nims.go.jp/filesets/7ab17d66-5ba1-4728-a482-1d8fdb392517/download) ([Detail](https://mdr.nims.go.jp/filesets/7ab17d66-5ba1-4728-a482-1d8fdb392517.md))

## Id

cfb086fc-aa63-4650-a746-608993018834

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2021-08-19T06:10:57.384702Z

## Updated at

2022-10-02T17:01:08.760078Z

## Published at

2021-10-13T13:30:04.582470Z

## Doi

https://doi.org/10.48505/nims.3030

## First published url



## Date published

2021-10-11

## Recorded date published

11/10/2021

## Resource type

dataset

## Manuscript type

authors_original

## Collection



## Title

- title: Process parameters and magnetic properties (coercivity, remanence, squareness,
    maximum energy product) of data-driven fabrication of Nd-Fe-B anisotropic magnets
    by direct hot extrusion.
  title_type: original
  lang: en

## Description

- description: "We implemented an active learning pipeline assisted by machine learning
    and Bayesian optimization (ALMLBO) for predicting magnetic properties (coercivity,
    remanence, squareness) of Nd-Fe-B anisotropic magnets fabricated by direct hot
    extrusion, using a fixed commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™),
    from their process parameters, and propose optimal processing leading to high
    coercivity and remanence, simultaneously. ALMLBO allowed us to optimize the process
    to exhibit high coercivity, \U0001D7B50Hc ~ 1.7 T, and remanence, \U0001D7B50Br
    ~ 1.4 T, resulting in an excellent maximum energy product, (BH)max ~ 380 kJ/m3.
    Therefore, the following dataset contains the process parameters (hot-press temperature
    and load; hot extrusion temperature, ram speed, and load limit; the identification
    number of the dies used at the extrusion exit) as well as the magnetic properties
    (coercivity, remanence, squareness, maximum energy product) of Nd-Fe-B anisotropic
    magnets, fabricated by direct hot extrusion, obtained before and during 3 cycles
    of ALMLBO."
  description_type: abstract
  lang: en

## Creator

- name: Lambard, Guillaume
  role: author
  orcid: https://orcid.org/0000-0003-0275-4079
- name: Sasaki, Taisuke
  role: author
  orcid: https://orcid.org/0000-0002-5952-7638
- name: Sodeyama, Keitaro
  role: author
  orcid: https://orcid.org/0000-0002-9228-0729
- name: Ohkubo, Tadakatsu
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
- name: Hono, Kazuhiro
  role: author
  orcid: https://orcid.org/0000-0001-7367-0193

## Contact agent



## Publisher

organization: National Institute for Materials Science
ror: https://ror.org/026v1ze26

## Managing organization



## Keyword

- subject: Maximum energy product
  schema: not_defined
- subject: Coercivity
  schema: not_defined
- subject: Squareness
  schema: not_defined
- subject: Machine learning
  schema: not_defined
- subject: Remanence
  schema: not_defined
- subject: Process
  schema: not_defined
- subject: Bayesian Optimization
  schema: not_defined
- subject: Hot extrusion
  schema: not_defined
- subject: Active learning
  schema: not_defined
- subject: Nd-Fe-B magnet
  schema: not_defined

## Rights



## Other identifier(s)



## Data origin



## Embargo



## Journal



## Conference



## Related item



## Funding



## Instrument

- name: B-H tracer
  description: Tamakawa Co., Ltd, TM-BH25-C1
- name: Carl Zeiss Crossbeam 1540 EsB FIB/SEM
  description: Carl Zeiss Crossbeam 1540 EsB FIB/SEM

## Instrument operator



## Instrument managing organization



## Measurement method

- description: other

## Specimen

- name: Nd-Fe-B anisotropic magnets fabricated by direct hot extrusion using a fixed
    commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™)
  description: Nd-Fe-B anisotropic magnets fabricated by direct hot extrusion using
    a fixed commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™)

## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 7ab17d66-5ba1-4728-a482-1d8fdb392517
  filename: DataSummary_Extrusion_Manuscript_20210728.xlsx
  content_type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
  size: 59747
  md5: 836b1a42c7246e73120fa0a273950fdd

## Thumbnail

fileset_id: 7ab17d66-5ba1-4728-a482-1d8fdb392517
filename: DataSummary_Extrusion_Manuscript_20210728.xlsx