The Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)permanent magnets in the form of rods were prepared by annealing the bulk amorphous alloys.The magnetic properties,phase evolution and microstructure of the alloys were investigated...The Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)permanent magnets in the form of rods were prepared by annealing the bulk amorphous alloys.The magnetic properties,phase evolution and microstructure of the alloys were investigated systematically.It is found that the glass forming ability(GFA), microstructure and magnetic properties are sensitive to Ga content for Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)bulk alloys.The annealed alloys are mainly composed of soft α-Fe,hard Nd2 Fe14B and nonmagnetic Nd1.1Fe4 B4 phases.When x = 0.3,the optimally annealed magnets exhibit magnetic properties of the remanence Br = 0.63 T,intrinsic coercivity Hcj = 368.68 kA/m and maximum energy product(BH)max = 33.73 kJ/m3.Furthermore,magnetic field heat treatment at the temperature close to Curie temperature of Nd2 Fe14B phase was applied to the annealed Fe69.2Nd7 B21Nb2.5Ga0.3 magnet.The results of X-ray diffraction(XRD)and transmission electron microscopy(TEM)indicate that the magnetic field heat treatment can be beneficial for the precipitation of α-Fe.Thus,the Br,Hcj and(BH)max are enhanced by 8.7%,6.3% and 16.3%,respectively.展开更多
研究了不同磁场强度热处理工艺对铁基纳米晶合金带材磁性能的影响。结果表明:铁基纳米晶合金带材的综合磁性能优劣受热处理磁场强度的影响很大。磁场强度为100 m T热处理后的铁基纳米晶合金磁芯矫顽力Hc、剩余磁感应强度Br和动态磁滞损...研究了不同磁场强度热处理工艺对铁基纳米晶合金带材磁性能的影响。结果表明:铁基纳米晶合金带材的综合磁性能优劣受热处理磁场强度的影响很大。磁场强度为100 m T热处理后的铁基纳米晶合金磁芯矫顽力Hc、剩余磁感应强度Br和动态磁滞损耗Ps同时达到最小值,分别为0.45 A/m、0.12 T、9.60 W/kg;并且在3MHz的高频条件下仍保持有3μH的较高电感量;在保证较高磁导率的同时,合金获得具有低损耗、低剩磁、低矫顽力,即具有良好的高频磁性能。展开更多
基金Project supported by the National Natural Science Foundation of China(51471101)
文摘The Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)permanent magnets in the form of rods were prepared by annealing the bulk amorphous alloys.The magnetic properties,phase evolution and microstructure of the alloys were investigated systematically.It is found that the glass forming ability(GFA), microstructure and magnetic properties are sensitive to Ga content for Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)bulk alloys.The annealed alloys are mainly composed of soft α-Fe,hard Nd2 Fe14B and nonmagnetic Nd1.1Fe4 B4 phases.When x = 0.3,the optimally annealed magnets exhibit magnetic properties of the remanence Br = 0.63 T,intrinsic coercivity Hcj = 368.68 kA/m and maximum energy product(BH)max = 33.73 kJ/m3.Furthermore,magnetic field heat treatment at the temperature close to Curie temperature of Nd2 Fe14B phase was applied to the annealed Fe69.2Nd7 B21Nb2.5Ga0.3 magnet.The results of X-ray diffraction(XRD)and transmission electron microscopy(TEM)indicate that the magnetic field heat treatment can be beneficial for the precipitation of α-Fe.Thus,the Br,Hcj and(BH)max are enhanced by 8.7%,6.3% and 16.3%,respectively.
