PREPARATION AND CHARACTERIZATION OF SmCo2 NANOCRYSTALLINE ALLOY WITH PERMANENT MAGNETIC PROPERTIES

LIANG Hai-Ning; LIU Xue-Mei; LV Nian-Duan; ZHANG Jiu-Xin; SONG Xiao-Yan; ZHANG Zhe-Xu

doi:10.3724/SP.J.1037.2010.00133

Acta Metall Sin >

2010 , Vol. 46 >Issue 8: 973 - 978

DOI: https://doi.org/10.3724/SP.J.1037.2010.00133

论文

PREPARATION AND CHARACTERIZATION OF SmCo₂NANOCRYSTALLINE ALLOY WITH PERMANENT MAGNETIC PROPERTIES

LIANG Hai-Ning ,
LIU Xue-Mei ,
LV Nian-Duan ,
ZHANG Jiu-Xin ,
SONG Xiao-Yan ,
ZHANG Zhe-Xu

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College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Received date: 2010-03-16

Revised date: 2010-04-29

Online published: 2010-08-10

Supported by

Supported by National Natural Science Foundation of China (No.50871001) and Program for New Century Excellent Talent from The Ministry of Education of China (No.NCET–06–0182)

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Abstract

The nanocrystalline SmCo₂ bulk alloy with an average grain size of about 22 nm was prepared by combining high–energy ball milling and spark plasma sintering (SPS), in preparation the amorphous alloy powder obtained by milling was densified and crystallized during the SPS process. The microstructure, crystal structure and phase structure of such SmCo₂ were determined. These results show that the nanocrystalline SmCo₂ is not able to exist stably as a single phase at room emperature and decoposes into SmCo₃ and Sm₉Co₄ phases, different from the conventional coarse–grained SmCo₂ phase, which exiss stably at room temperature. Phase stability and transformation behavior have been explained by he nanocale thermodynamic simulation. Comparing with the coarse– grained SmCo₂ with very weak magnetic properties, the nnocrystalline SmCo₂ exhibits remarkable permanent magnetism and good overall magnetc properties.

Key words： Sm–Co alloy; nanocrystalline alloy; phase sability; microstructure; magnetic properties

Cite this article

LIANG Hai-Ning , LIU Xue-Mei , LV Nian-Duan , ZHANG Jiu-Xin , SONG Xiao-Yan , ZHANG Zhe-Xu . PREPARATION AND CHARACTERIZATION OF SmCo₂NANOCRYSTALLINE ALLOY WITH PERMANENT MAGNETIC PROPERTIES[J]. Acta Metall Sin, 2010 , 46(8) : 973 -978 . DOI: 10.3724/SP.J.1037.2010.00133

References

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