铌对纳米晶Nd_2Fe_(14)B合金组织结构与磁性能的影响

Effect of Nb addition on microstructure and magnetic properties of a nanocrystalline Nd_2Fe_(14)B-type alloy

采用熔体快淬及晶化退火工艺制备了单相Nd2Fe14B纳米晶合金。研究了添加Nb对Nd12.3Fe81.7-xNbxB6.0(x=0.5,1.0,1.5,2.0,2.5,3.0)系列合金的微观组织、磁性能和晶化行为的影响规律。结果表明:添加Nb可提高晶化温度并稳定非晶相;在退火晶化过程中,加入Nb后形成的析出相可以抑制晶粒长大,使晶粒细化且分布均匀,进而提高了材料的综合磁性能。通过对系列合金磁性能分析可知:Nd12.3Fe81.2Nb0.5B6.0合金在600℃退火处理10min后的磁性能最佳,磁能积(BH)m=141.13kJ.m-3,矫顽力Hci=867.95kA.m-1,剩磁Jr=1.02T。

Nano-crystal Nd2Fe14B alloys were obtained by crystallizing the amorphous melt-spun ribbons. The effects of adding Nb on the microstrueture, magnetic properties and crystallization behaviors of the Nd12.3Fe81.7-xNbxB6.0 （x = 0.5 ; 1.0 ; 1.5 ; 2.0 ; 2.5 ; 3.0） alloy system were studied. It is found that Nb additions may increase the crystallization temperature and stabilize the amorphous phase. In the crystallization process by annealing, the phase precipitated after adding Nb would curb the growth of crystals, making them become fine and uniform distribution. Therefore, the comprehensive magnetic properties of the materials have been improved. From the analyzing of the magnetic properties of the alloy system, it is found that after annealing at 600℃ for 10 minutes, the Nd12.3Fe81.2-Nb0.5B6.0 alloy has the optimum magnetic properties： （BH）m= 141.13kJ/m^3 ,Hci = 867.95 kA/m,Jx= 1.02T.