Fe_(44)Co_(20)Nd_7Nb_4B_(25)大块非晶合金磁性及热稳定性研究  

Magnetic Properties and Thermal Stability of Fe_(44)Co_(20)Nd_7Nb_4B_(25) Bulk Amorphous Alloy

作　　者：满华[1,2] 徐晖[1] 谭晓华[1] 唐永军[1] 白琴[1] 侯雪玲[1] 

机构地区：[1]上海大学,上海200444 [2]华东交通大学,江西南昌330013

出　　处：《稀有金属材料与工程》2013年第9期1879-1883,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51071099;51171101)

摘　　要：采用铜模吸铸法制备了Fe44Co20Nd7Nb4B25大块非晶合金,利用差示扫描量热仪(DSC)、X射线衍射仪(XRD)、高分辨透射电镜(HRTEM)和振动样品磁强计(VSM)研究了该合金的结构、非晶形成能力、热稳定性及磁性能。结果表明:该合金为完全非晶结构,在室温下表现为良好的软磁性,并具有较好的非晶形成能力和热稳定性,晶化激活能Ep为642 kJ/mol。退火后该合金表现为硬磁性,退火温度为1003 K时,内禀矫顽力i Hc达到最大值,为1164 kA/m;退火温度为963 K时,剩余磁感应强度Br和最大磁能积(BH)max的值最大,分别为0.27 T和15.79 kJ/m3。Fe44Co20Nd7Nb4B25 bulk amorphous alloy was prepared by copper mold casting. The microstructure, glass-forming ability, thermal stability and magnetic properties were investigated by X-ray diffraction （XRD）, high-resolution transmission electron microscopy （HRTEM）, differential scanning calorimetry （DSC） and vibrating sample magnetometer （VSM）. It is found that Fe44Co20Nd7Nb4B25 alloy with amorphous structure exhibits good soft magnetic property, excellent glass-forming ability and thermal stability. The value of activation energy, Ep, is 642 kJ/mol. The annealed sample shows hard magnetic behavior, and the maximum value of intrinsic coercivity （iHc） is 1164 kA/m after annealing at 1003 K. When annealed at 963 K, the values of remanence （Br） and maximum energy product （（BH）max） reaches a maximum of 0.27 T and 15.79 kJ/m3, respectively.

关 键 词：大块非晶合金 热稳定性 非晶晶化 磁性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG115.27[金属学及工艺—合金]