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Multiphase Characterization of Phase Equilibria in the Tb-Rich Corner of the Co-Cu-Tb System

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F19%3A10242368" target="_blank" >RIV/61989100:27240/19:10242368 - isvavai.cz</a>

  • Alternative codes found

    RIV/61989100:27360/19:10242368

  • Result on the web

    <a href="https://link.springer.com/article/10.1007/s11669-019-00735-x" target="_blank" >https://link.springer.com/article/10.1007/s11669-019-00735-x</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/s11669-019-00735-x" target="_blank" >10.1007/s11669-019-00735-x</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Multiphase Characterization of Phase Equilibria in the Tb-Rich Corner of the Co-Cu-Tb System

  • Original language description

    In recent years, the grain-boundary diffusion (GBD) and grain-boundary restructuring processes used in manufacturing Nd-Fe-B magnets show promise as procedures that allow one to increase their hysteretic characteristics. The processes are realized by adding various amounts of heavy-rare-earth metals (in the form of hydrides, oxides, intermetallic compounds, etc.) to powder mixtures. The additions decompose or melt during subsequent heat treatment, and their components diffuse into grains and remain within the grain-boundary phase and thus, increase the anisotropy field of the main-magnetic (Nd2Fe14B-based) phase and improve the grain-boundary structure, respectively. In the present study, we consider alloys near the Tb-3(Co0.6Cu0.4) composition as such an addition, which is of importance in designing the microstructure of Nd-Fe-B permanent magnets allowing us to economically alloy them with terbium (via GBD) simultaneously making copper and cobalt parts of the magnet composition. The phase equilibria in the Tb-rich corner of the Co-Cu-Tb system near the Tb-3(Co0.6Cu0.4) composition, which was found to be multiphase, are assessed based on electron microscopy studies, data from electron microprobe, x-ray diffraction, and differential thermal analyses, and from magnetic measurements. A portion of the isothermal section for compositions Tb-40at.% Co-50at.% Cu at 600 degrees C was constructed. The copper solubility in Tb-3(Co,Cu) and Tb-12(Co,Cu)(7), and Co solubility in the Tb(Cu,Co) compound were determined, which are up to 6.5, 14.5, and 10at.%, respectively. The possibility of hydrogenation of the multiphase composition with the formation of TbHx, and fine Co and Cu powders, which are components for diffusion in manufacturing permanent magnets, is demonstrated.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    20501 - Materials engineering

Result continuities

  • Project

    <a href="/en/project/LTARF18031" target="_blank" >LTARF18031: Development of physico-chemical and engineering foundations for the initiation of innovative resources-economy technology of high-power and high-coercivity (Nd,R)-Fe-B (R = Pr, Tb, Dy, Ho) low-REM permanent magnets</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Phase Equilibria and Diffusion

  • ISSN

    1547-7037

  • e-ISSN

  • Volume of the periodical

    40

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    10

  • Pages from-to

    403-412

  • UT code for WoS article

    000474474300007

  • EID of the result in the Scopus database

    2-s2.0-85067384509