Fe_(72-x)Nd_7B_(21)Nb_x(x=0～4.0)块体合金晶化过程和磁性能的研究  

Crystallization and Magnetic Properties in Fe_(72-x)Nd_7B_(21)Nb_x(x=0～4.0) Bulk Alloys

作　　者：黄晓倩 徐晖[1] 谭晓华[1] 王同辉 张晴[1] 侯雪玲[1] 

机构地区：[1]上海大学,上海200072 [2]上海工程技术大学,上海201620

出　　处：《稀有金属材料与工程》2018年第1期214-218,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51171101;51471101);国家"973计划"项目(2015CB856800)

摘　　要：采用铜模吸铸法制备了直径为2mm的Fe_(72-x)Nd_7B_(21)Nb_x(x=0~4.0)块体合金,利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、振动样品磁强计(VSM)和多功能物理性质测量系统(PPMS)研究了Nb含量对该体系合金非晶形成能力、晶化行为及磁性能的影响。结果表明:适当的添加Nb有助于提高该体系合金的非晶形成能力,当Nb含量为2.0at%,2.2at%和2.5at%时,可以获得基本为非晶结构的块体合金。Nb含量对该体系合金的晶化行为有着重要影响,Nb含量为2.5at%的合金在晶化过程中能有效抑制非磁性相的析出,增强了晶粒间的交换耦合作用,使得其剩磁得到明显的提高,具有最佳的综合磁性能:B_r=0.63T,H_(ci)=448.97kA/m,(BH)_(max)=36.32kJ/m^3。Fe72-xNd7B21＂Nbx （x=0-4.0） bulk alloys with 2 mm in diameter were fabricated by copper mold casting. The influence of Nb addition on the glass forming ability, crystallization and magnetic properties of the alloys have been investigated by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, vibrating sample magnetometer （VSM） and physical property measurement system （PPMS）. The results show that appropriate addition of Nb can improve the glass forming ability of the Fe72-xNdvB2Nbx bulk alloys. The fully amorphous ingots are obtained when Nb content is 2.0 at%, 2.2 at% and 2.5 at%. Nb is found to be effective in adjusting the alloy composition and decreasing the volume fraction of paramagnetic Ndl.Fe4B4 phase. When Nb content is 2.5 at%, the alloy exhibits optimal hard magnetic properties with the remanence （Br） of 0.63 T, intrinsic coercivity （Hci） of 448.97 kA/m and maximum energy product （（BH）m,） of 36.32 kJ/m3. The enhanced magnetic properties can be ascribed to the strong exchange coupling among grains and high remanence

关 键 词：Fe基大块非晶合金 永磁体 晶化 剩磁 

分 类 号：TG132.2[一般工业技术—材料科学与工程]