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Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys.

ABSTRACT: Ce substituted Nd2Fe14B (2:14:1)-type permanent magnets have shown increasing potential in the applications due to their high properties/cost ratio. However, the element segregation and phase separation in the Ce substituted magnets have not been fully understood yet. In this work, (Nd1-xCex)25Fe40Co20Al4B11 alloys with high coercivities were prepared by copper mold casting. Based on detailed microstructure and composition analysis, the segregation of rare earth (RE) elements was observed in the as-cast alloys. Nd element prefers to enter into the 2:14:1 phase and the Ce element enter into the 1:2 phase. The existence of the 1:2 phase can promote the element segregation. The alloy shows an abnormal increase of coercivity from 641?kA/m for x?=?0.2 to 863?kA/m for x?=?0.3. This increase could be attributed to the phase separation of the 2:14:1 phase, which has been confirmed by the microstructural characterization. The present data provides useful information for exploring Ce-containing Nd-Fe-B magnets.

SUBMITTER: Zhao LZ 

PROVIDER: S-EPMC5931561 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys.

Zhao L Z LZ   Zhang J S JS   Ahmed G G   Liao X F XF   Liu Z W ZW   Greneche J M JM  

Scientific reports 20180501 1

Ce substituted Nd<sub>2</sub>Fe<sub>14</sub>B (2:14:1)-type permanent magnets have shown increasing potential in the applications due to their high properties/cost ratio. However, the element segregation and phase separation in the Ce substituted magnets have not been fully understood yet. In this work, (Nd<sub>1-x</sub>Ce<sub>x</sub>)<sub>25</sub>Fe<sub>40</sub>Co<sub>20</sub>Al<sub>4</sub>B<sub>11</sub> alloys with high coercivities were prepared by copper mold casting. Based on detailed micro  ...[more]

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