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
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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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
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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