基于磁相互作用探索P掺杂对Fe-Si-Nb-Cu-B合金带材组织结构和软磁性能的影响

The effect of P addition on the microstructure and soft magnetic properties of Fe-Si-Nb-Cu-B ribbons based on magnetic interaction

类金属元素是改善Fe基非晶纳米晶合金非晶形成能力和软磁性能的重要添加剂。用单辊甩带法制备了Fe_(73.5)Si_(13.5)Nb_(3)Cu_(1)B_(9-x)P_(x)(x=0,3%,6%,9%)(原子分数)合金带材,从各元素间磁相互作用出发探索了P替换B对合金组织结构和软磁性能的影响。实验结果表明,P添加可有效提高合金的初晶相晶化温度以及合金的非晶形成能力;但是二次晶化相的析出温度降低,弱化了其热稳定性。当P含量为3%(原子分数)时,合金有较宽的退火温度窗口,且可有效细化初晶相晶粒尺寸,并在525℃退火后表现出最佳软磁性能,此时合金晶粒尺寸为9 nm,矫顽力为0.21 A/m,同时有效磁导率高于x=0合金。但是由于P的添加,残余非晶相中Fe的磁矩降低,导致合金的饱和磁感应强度降低。

By alloying metalloid element,the amorphous forming ability and soft magnetic properties could be improved for the Fe based amorphous and nanocrystalline alloys.In this paper,Fe_(73.5)Si_(13.5)Nb_(3)Cu_(1)B_(9-x)P_(x)(x=0,3 at%,6 at%,9 at%)ribbons were fabricated using the melt spinning technique,and the effect of substitution of B by P on the microstructure and soft magnetic properties have been studied based on the magnetic interaction between elements.It is found that,P addition improves the onset temperature of the primary crystallization and thus the glass forming ability,but reduces the onset temperature of the secondary crystallization and thus its thermal stability.The 3 at%P addition is beneficial for the precipitation ofα-Fe and the grain size refinement.After annealed at 525℃,the optimal soft magnetic properties are obtained in x=3 at%alloy,meanwhile,the grain size is 9 nm,the coercivity is 0.21 A/m and the effective permeability is higher than that of x=0 alloy.However,P addition decreases the magnetic moment of Fe in the residual amorphous phase and thus the saturation magnetization.