Phase constitution and microstructure of Ce-Fe-B strip-casting alloy

doi:10.1088/1674-1056/23/10/107501

Abstract The strip-casting technique plays an important role in fabricating high coercivity sintered magnet. In this paper, we investigate the phase constitution and the microstructure of rapidly solidified Ce-Fe-B alloy fabricated by strip-casting. We find that the Ce₂Fe₁₄B phase coexists with Fe, Fe₂B, and CeFe₂ phases in the Ce-Fe-B strips. The eutectic structure consisting of Fe and Fe₂B is encased in Ce₂Fe₁₄B grains, which is blocked by the CeFe₂ grains at triple junctions, indicating that the microstructure of Ce-Fe-B strip is characteristic of a peritectic solidification. Thermal analysis indicates that the large supercooling of Ce₂Fe₁₄B results in the residual Fe and Fe₂B. The microstructural optimization in Ce-Fe-B strips without Fe and Fe₂B could be achieved by a heat treatment of 1000℃.

Keywords: magnetic material Ce-Fe-B microstructure rapid solidification

Received: 19 December 2013
Revised: 28 March 2014
Accepted manuscript online:

PACS:

75.50.Ww

(Permanent magnets)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA03A401).

Corresponding Authors: Yan A-Ru
E-mail: aruyan@nimte.ac.cn

About author: 75.50.Ww

Cite this article:

Yan Chang-Jiang (严长江), Guo Shuai (郭帅), Chen Ren-Jie (陈仁杰), Lee Dong (李东), Yan A-Ru (闫阿儒) Phase constitution and microstructure of Ce-Fe-B strip-casting alloy 2014 Chin. Phys. B 23 107501


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