Structure and intrinsic magnetic properties of MM_2Fe_(14)B(MM=La,Ce,Pr,Nd)alloys  

作　　者：余效强 岳明 刘卫强 李智 朱明刚 董生智 

机构地区：[1]College of Materials Science and Engineering.Beijing University of Technology,Beijing 100124,China [2]Division of Functional Materials,Central Iron&Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Rare Earths》2016年第6期614-617,共4页稀土学报（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China(2012AA063201);National Natural Science Foundation of China(51371002;51331003);International S&T Cooperation Program of China(2015DFG52020);the 2011 Cooperative Innovation Center of Beijing University of Technology

摘　　要：MM_（33）Fe_（66）B（MM=La, Ce, Pr, Nd） alloys（mass ratio） were prepared by induction melting and heat-treated at 1353 K for 24 h to produce homogeneous MM_2Fe_（14） B phase. The phase structure and element distribution of the alloys were analyzed by X-ray diffraction（XRD） and scanning electron microscope（SEM）. The alloys were applied ball milling to obtain powders with good size distribution and then magnetic aligned in a static magnetic field of 2 T for 4 h, in order to achieve the intrinsic magnetic properties by vibrating sample magnetometer（VSM）. XRD results showed that the alloys were composed of the single 2：14：1 main phase and RE-rich phase, which was similar to Nd_2Fe_（14）B structure. Magnetic measurements showed that the saturation magnetization（Ms） and anisotropy field（HA） of the MM_（33）Fe_（66）B alloy were 11.3 k Gs and 48.4 k Oe, respectively, demonstrating its good potential as permanent magnets. The Curie temperature of the MM_（33）Fe_（66）B alloy was determined as 502.9 K by magnetization-temperature curves. Microstructure observation showed that Nd and Pr were mainly in the 2：14：1 ferromagnetic phase, while La and Ce prefered to aggregate in the RE-rich grain boundary phase, which is beneficial to fabricating（Pr, Nd, MM）_2Fe_（14）B magnets with good magnetic properties.MM_（33）Fe_（66）B（MM=La, Ce, Pr, Nd） alloys（mass ratio） were prepared by induction melting and heat-treated at 1353 K for 24 h to produce homogeneous MM_2Fe_（14） B phase. The phase structure and element distribution of the alloys were analyzed by X-ray diffraction（XRD） and scanning electron microscope（SEM）. The alloys were applied ball milling to obtain powders with good size distribution and then magnetic aligned in a static magnetic field of 2 T for 4 h, in order to achieve the intrinsic magnetic properties by vibrating sample magnetometer（VSM）. XRD results showed that the alloys were composed of the single 2：14：1 main phase and RE-rich phase, which was similar to Nd_2Fe_（14）B structure. Magnetic measurements showed that the saturation magnetization（Ms） and anisotropy field（HA） of the MM_（33）Fe_（66）B alloy were 11.3 k Gs and 48.4 k Oe, respectively, demonstrating its good potential as permanent magnets. The Curie temperature of the MM_（33）Fe_（66）B alloy was determined as 502.9 K by magnetization-temperature curves. Microstructure observation showed that Nd and Pr were mainly in the 2：14：1 ferromagnetic phase, while La and Ce prefered to aggregate in the RE-rich grain boundary phase, which is beneficial to fabricating（Pr, Nd, MM）_2Fe_（14）B magnets with good magnetic properties.

关 键 词：misch-metal STRUCTURE intrinsic magnetic properties MM_（33）Fe_（66）B alloys microstructure rare earths 

分 类 号：TG146.45[一般工业技术—材料科学与工程]