(FeCo)_(73.5)Cu_1Nb_3Si_(13.5)B_9的晶化处理及微结构  

Nanocrystallization and microstructure of (FeCo)_(73.5)Cu_1Nb_3Si_(13.5)B_9

作　　者：李丽娅[1] 易健宏[1] 葛毅成[1] 彭元东[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第3期522-526,共5页Journal of Central South University:Science and Technology

基　　金：湖南省自然科学基金资助项目(04JJ6029)

摘　　要：采用熔体快淬+晶化处理方法制备宽度为4 mm、厚度为30μm的Fe73.5Cu1Nb3Si13.5B9纳米晶软磁合金,并用XRD和TEM对其微结构进行表征。研究结果表明:(FeCo)73.5Cu1Nb3Si13.5B9于600℃晶化处理15 min后具有较高的饱和磁化强度(1.30 T)和较小的矫顽力(4.61 A/m);提高晶化温度至700℃,合金的软磁性能迅速降低,饱和磁化强度为1.02 T,矫顽力增大至1.95 kA/m;于600℃晶化处理5 min时,合金主要由非晶构成,同时有少量α-Fe(Si)相;于600℃晶化处理15 min后合金由α-Fe(Si)主相和少量残余非晶相构成,α-Fe(Si)相的晶粒粒径约为15 nm;于700℃晶化处理15 min后,合金由α-Fe(Si)相、残余非晶相和少量Fe3B相构成,α-Fe(Si)相的晶粒粒径约为27.9 nm。Fe3B相的形成、α-Fe(Si)相晶粒粒径的长大和晶格常数的增大直接导致合金软磁性能下降。Amorphous ribbons with 4 mm in width, 30 μm in thickness were obtained by the melt spinning technique with nominal compositions （FeCo）73.5Cu1Nb3Si13.5B9 and the microstructure features were investigated by using TEM and XRD. The magnet annealed at 600 ℃for 15 min shows the highest saturation magnetization of 1.30 T and low coercivity of 4.61 ACre. The soft magnetic properties of the alloy are deteriorated by increasing the annealing temperature to 700℃, saturation magnetization decreases to 1.02 T and coercivity increases to 1.95 kA/m. After annealing at 600℃for 5 min, amorphous structure is kept with little α-Fe（Si） nanocrystallites embedded in it. The alloy annealed at 600 ℃ for 15 min is characterized mainly by the precipitation of randomly oriented α-Fe（Si） nanocrystals embedded in a residual amorphous matrix, and the grain size of α-Fe（Si） phase is about 15 nm. When amorphous alloy is annealed at 700 ℃for 15 rain, this nanocrystalline material consists of α-Fe（Si） phase, amorphous structure, and little Fe3B phase. The grain size of α-Fe（Si） phase increases to about 27.9 nm. The formation of Fe3B phase, the grain coarsening of α-Fe（Si） phase and the increase of crystal lattice constant decrease the soft magnetic properties of the magnets.

关 键 词：(FeCo)73.5Cu1Nb3Si13.5B9 非晶 α—Fe(Si)晶化 

分 类 号：TM271.2[一般工业技术—材料科学与工程] TG132.271[电气工程—电工理论与新技术]