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用X射线衍射(XRD)、差示扫描量热分析(DSC)、高分辨扫描电镜(HRSEM)和振动样品磁强计(VSM)等研究了Nd含量对快淬纳米晶Nd_xFe_(94-x)B_6(x=11.0—16.8)合金的组织结构、磁性能、交换耦合作用和矫顽力的影响.结果表明,22 m/s(甩带速度)快淬带在最佳退火条件下,合金带的内禀矫顽力H_(ci)由x=11.0的601.3 kA/m单调升高到x=16.8的1277.3 kA/m;相反,剩余磁极化强度J_r由x=11.0的1.047 T单调下降到x=16.8的0.721T,最大磁能积(BH)_(max)随Nd含量增加先升高后下降;Nd_(11.8) Fe_(82.2)B_6合金带的综合性能最好:J_r=0.992 T,H_(ci)=727.9 kA/m,(BH)_(max)= 137.2 kJ/m~3.Nd_2Fe_(14)B晶粒之间的交换耦合作用随Nd含量增加而降低,但x=16.8的合金带仍具有较强的交换耦合作用矫顽力主要由钉扎场决定.最佳退火后,合金薄带的晶粒尺寸随Nd含量增加无明显变化.针对不同Nd含量的合金,建立了一个组织模型,利用该模型很好地解释了Nd含量对磁性能及交换耦合作用的影响机制.
The effect of Nd content on the quenching rate of Nd_xFe_ (94-x) nanocrystallites was investigated by XRD, DSC, HRSEM and VSM. B_6 (x = 11.0-16.8) alloy structure, magnetic properties, exchange coupling and coercivity.The results show that under the optimal annealing conditions, the alloy strip with 22 m / s , The intrinsic coercivity H_ (ci) increases monotonically from 601.3 kA / m at x = 11.0 to 1277.3 kA / m at x = 16.8. On the other hand, the residual magnetic polarization J_r monotonically decreases from 1.047 T at x = 11.0 to x The maximum energy product (BH) _ (max) of Nd_ (11.8) Fe_ (82.2) B_6 alloy band is the best: J_r = 0.992 T, H_ The exchange coupling between the grains of Nd 2 Fe 14 B reduced with the increase of Nd content, but the band of x = 16.8 The coercive force is still mainly determined by the pinning field.After annealing, the grain size of the alloy ribbon does not change significantly with the increase of Nd content.For the different Nd content alloy, a tissue model , Using this model a good explanation of Nd Effect of the mechanism coupling the magnetic properties and the amount of exchange.