论文部分内容阅读
利用X射线衍射仪(XRD)、振动样品磁强计(VSM)、透射电子显微镜(TEM)和三维原子探针(3DAP)等研究了Nb元素对纳米晶复合Nd_(9.5)Fe_(79-x)Co_5Nb_xB_(6.5)(x=0,1,2,3)永磁合金微结构和磁性能的影响。结果表明,随着Nb元素的增加,合金的剩磁J _r首先增加,在Nb含量为1 at%时达到最大值0.94 T,继续增加Nb元素后,合金的剩磁开始下降;矫顽力_i H_c则随着Nb元素的增加逐步增加,当Nb含量超过2 at%后,增加幅度变缓;合金的最大磁能积(BH)_(max)随着Nb元素的增加先增加后降低,纳米晶复合Nd_(9.5)Fe_(79-x)Co_5Nb_xB_(6.5)合金具有最优的综合磁性能,即J_r=0.91 T,_i H_c=663k A/m,(BH)_(max)=120 k J/m~3。Nb元素在合金的晶化过程中富集于晶间形成Nb Fe B相,有利于细化晶粒尺寸,从而提高合金的磁性能。
The effect of Nb on the nanocrystalline composite Nd_ (9.5) Fe_ (79-x) has been investigated by XRD, VSM, TEM and 3DAP. ) Co_5Nb_xB_ (6.5) (x = 0,1,2,3) permanent magnet alloy microstructure and magnetic properties. The results show that with the increase of Nb, the remanence J_r of the alloy increases first and reaches 0.94 T at the maximum of 1 at% Nb. The remanence of the alloy begins to decrease after the Nb addition. Coercivity _ i H_c increases gradually with the increase of Nb content. When Nb content exceeds 2 at%, the increase amplitude slows down. The maximum energy product (BH) _ (max) of alloy increases first and then decreases with the increase of Nb content. The crystal composition of Nd_ (9.5) Fe_ (79-x) Co_5Nb_xB_ (6.5) alloy has the best comprehensive magnetic properties, ie J_r = 0.91 T, _i H_c = 663 k A / m, / m ~ 3. The Nb element is enriched in the intergranular phase to form Nb Fe B phase during the crystallization of the alloy, which is beneficial to refine the grain size and improve the magnetic properties of the alloy.