贫稀土Pr_(4.5)Fe_(77)B_(18.5)非晶合金晶化动力学研究  

Crystallization Kinetics of Lean Rare-Earth Pr_(4.5)Fe_(77)B_(18.5) Amorphous Allo

作　　者：泮敏翔[1] 张朋越[1] 葛洪良[1] 吴琼[1] 杨杭福[1] 宫杰[1] 

机构地区：[1]中国计量学院,浙江杭州310018

出　　处：《稀有金属材料与工程》2012年第9期1646-1650,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51001092);浙江省科学计划项目(2009C21010);浙江省自然基金(Y6100640);浙江省优秀教师计划

摘　　要：利用X射线衍射分析仪、透射电镜、振动样品磁强计和差示扫描量热仪研究贫稀土非晶Pr4.5Fe77B18.5合金中Fe3B/Pr2Fe14B复合纳米晶的晶体结构、磁性能及其晶化动力学。结果表明,经650℃晶化退火处理后,Pr4.5Fe77B18.5合金的晶化相主要由软磁相Fe3B和硬磁相Pr2Fe14B组成,而且退火后复合纳米晶磁体晶粒细小、分布均匀,磁滞回线呈现单一的硬磁特征,表明其具有较强的交换耦合作用。晶化动力学研究表明,软磁相Fe3B易成核、难生长和Pr2Fe14B相的难成核易生长的晶化行为是Fe3B/Pr2Fe14B复合纳米磁体具有较好磁耦合性能的根本原因。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 ~C for 10 rain, 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.

关 键 词：贫稀土 非晶合金 纳米复合永磁材料 晶化动力学 

分 类 号：TG139.8[一般工业技术—材料科学与工程]