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貧稀土Pr4.5Fe77B18.5非晶合金晶化動力學(xué)研究
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國家自然科學(xué)基金（51001092）；浙江省科學(xué)計(jì)劃項(xiàng)目（2009C21010）；浙江省自然基金（Y6100640）；浙江省優(yōu)秀教師計(jì)劃


Crystallization Kinetics of Lean Rare-Earth Pr4.5Fe77B18.5 Amorphous Alloy
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    摘要:

    利用X射線衍射分析儀、透射電鏡、振動樣品磁強(qiáng)計(jì)和差示掃描量熱儀研究貧稀土非晶Pr4.5Fe77B18.5合金中Fe3B/Pr2Fe14B復(fù)合納米晶的晶體結(jié)構(gòu)、磁性能及其晶化動力學(xué)。結(jié)果表明，經(jīng)650 ℃晶化退火處理后，Pr4.5Fe77B18.5合金的晶化相主要由軟磁相Fe3B和硬磁相Pr2Fe14B組成，而且退火后復(fù)合納米晶磁體晶粒細(xì)小、分布均勻，磁滯回線呈現(xiàn)單一的硬磁特征，表明其具有較強(qiáng)的交換耦合作用。晶化動力學(xué)研究表明，軟磁相Fe3B易成核、難生長和Pr2Fe14B相的難成核易生長的晶化行為是Fe3B/Pr2Fe14B復(fù)合納米磁體具有較好磁耦合性能的根本原因。

    Abstract:

    The crystal structure, magnetic properties and crystallization kinetics of the Fe3B/Pr2Fe14B nanocomposite prepared from lean rare-earth Pr4.5Fe77B18.5 amorphous alloy have been investigated by X-ray diffractometer (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and differential thermal analysis (DTA). The results indicate that the phases of this sample are composed of Fe3B soft-magnetic phase and Pr2Fe14B hard-magnetic phase as the alloy annealed at 650 oC for 10 min, and the grains are very small and homogeneously distributed in this nannocomposite alloys. The result of VSM analysis presents a single hard-magnetic phase behavior in this alloy. The study on crystallization kinetics for the Fe3B/Pr2Fe14B nanocomposite alloy indicates that the crystallization behavior with easy nucleation and difficult growth of Fe3B phase and with difficult nucleation and easy growth of Pr2Fe14B phase, essentially results in a stronger exchange-coupling effect in Fe3B/Pr2Fe14B nanocomposite.

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泮敏翔,張朋越,葛洪良,吳 瓊,楊杭福,宮 杰.貧稀土Pr4.5Fe77B18.5非晶合金晶化動力學(xué)研究[J].稀有金屬材料與工程,2012,41(9):1646~1650.[Pan Minxiang, Zhang Pengyue, Ge Hongliang, Wu Qiong, Yang Hangfu, Gong Jie. Crystallization Kinetics of Lean Rare-Earth Pr4.5Fe77B18.5 Amorphous Alloy[J]. Rare Metal Materials and Engineering,2012,41(9):1646~1650.]
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  • 收稿日期:2011-09-23
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