Journal
SCRIPTA MATERIALIA
Volume 170, Issue -, Pages 150-155Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.05.041
Keywords
Nd-Ce-Fe-B; REFe2 phase; Ce segregation; Microstructure
Categories
Funding
- National Natural Science Foundation of China [51801181, 51801047, 51571176, 51590881]
- National Key Research and Development Program of China [2016YFB0700902]
- Key Research and Development Program of Zhejiang Province [2017C01031]
- Fundamental Research Funds for the Central Universities [2019QNA4011]
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REFe2 (RE = rare earth) phase has been considered to form spontaneously in Nd-Ce-Fe-B cast strips and inherit into sintered magnets. However, here we report that REFe2 phase, which is absent in starting strip, occurs in as-sintered magnet with an identical composition of 25 wt% Ce. More interestingly, the formation of REFe2 induces apparent Ce-enriched shell surrounding RE2Fe14B grain, which is further exacerbated in annealed magnet containing a higher fraction of REFe2 phase. Influences of increasing REFe2 fraction on magnetic performance are revealed. Above findings on REFe2 phase evolution and resultant Ce segregation may shed lights on fabricating high-performance Nd-Ce-Fe-B. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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