Dataset

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.

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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, 𝞵0Hc ~ 1.7 T, and remanence, 𝞵0Br ~ 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

DOI
Creator
Keyword
Resource type
Data origin
Material/Specimen
  • Anisotropic permanent magnets fabricated by hot extrusion using a commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™)
Publisher
Date published
  • 11/10/2021
Rights statement
Licensed Date
  • 11/05/2021
Language
Last modified
  • 11/10/2021
Version
  • Version
    1.1
    Date
    11/05/2021

Method

Characterization methods
Computational methods
Properties addressed
Synthesis and processing

Instruments

Instrument
  • Title
    Carl Zeiss Crossbeam 1540 EsB FIB/SEM
    Collected
    31/03/2021
    Description
    Carl Zeiss Crossbeam 1540 EsB FIB/SEM
    Instrument function
    Category
    SEM/FIB
    Manufacturer
    Organization
    Zeiss
    Role
    Manufacturer
    Model number
    Crossbeam 1540 EsB FIB/SEM
    Operator
    Name
    PRYTULIAK, Anastasiia
    Organization
    National Institute for Materials Science
    Sub organization
    MaDIS
    Role
    operator
    Title
    B-H tracer
    Collected
    28/09/2020
    Description
    Tamakawa Co., Ltd, TM-BH25-C1
    Instrument function
    Category
    B-H tracer
    Description
    Measure the magnetization curve B-H of cuboids with 6 mm in width, 6 mm in thickness, and 5~8 mm in height
    Manufacturer
    Organization
    Tamakawa Co., Ltd
    Role
    Manufacturer
    Model number
    TM-BH25-C1
    Operator
    Name
    TOYOOKA, Yoshiya
    Organization
    National Institute for Materials Science
    Sub organization
    Research Center for Magnetic and Spintronic Materials
    Role
    operator

Specimen details

Specimen type
  • Title
    Nd-Fe-B anisotropic magnets fabricated by direct hot extrusion using a fixed commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™)
    Chemical composition
    Description
    Nd14Fe76Co3.4B6Ga0.6 (at%) (MQU-F™)
    Crystallographic structure
    Description
    Nd14Fe76Co3.4B6Ga0.6 (at%)
    Description
    Nd-Fe-B anisotropic magnets fabricated by direct hot extrusion using a fixed commercial Nd14Fe76Co3.4B6Ga0.6 (at%) powder (MQU-F™)
    Purchase record
    Supplier
    Role
    Supplier
    Manufacturer
    Role
    Manufacturer

Items

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DataSummary_Extrusion_Manuscript_20210728.xlsx 04/08/2021 58.3 KB MDR Open