您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

[PDF Download]    [Flash Online]

    

Mechanically activated disproportionation of NdFeB alloy by ball milling in hydrogen
HU Lian-xi(胡连喜), SHI Gang(石 刚), WANG Er-de(王尔德)

School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China

Abstract:Mechanically activated disproportionation of Nd12Fe82B6 alloy by ball milling in hydrogen atmosphere was experimentally investigated. The aspects of thermodynamics and kinetics for the mechanically activated disproportionation of the NdFeB alloy were discussed. Both the evolution of the disproportionation reaction and the corresponding microstructure change of the alloy during milling were characterized by X-ray diffraction (XRD) analysis. The results show that the matrix phase Nd2Fe14B of the as-cast Nd12Fe82B6 alloy can be disproportionated into a mixture of Nd-hydride (H5Nd2), FeB/Fe2B, and α-Fe, by ball milling under hydrogen pressure of 0.2MPa. The as-disproportionated phases are of the size about 20nm, suggesting that ball milling in hydrogen is an effective route for low-temperature disproportionation processing of the NdFeB alloy to ensure a full nano-structured as-disproportionated microstructure. This is the basis for synthesizing Nd2Fe14B/α-Fe nano-composites with magnetic exchange coupling effect by subsequent desorption-recombination processing.

 

Key words: mechanically activated disproportionation; NdFeB alloy; nano-structured phases; ball milling

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn