Microstructure of explosively compacted Nd-Fe-B magnet by TEM  

作　　者：敖琪 刘薇 曹力军 吴建生 

机构地区：[1]Key Laboratory for High Temperature Materials and Tests, Ministry of Education, Shanghai Jiaotong University, Shanghai 200030, China

出　　处：《中国有色金属学会会刊：英文版》2005年第2期468-472,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50071035) supported by the National Natural Science Foundation of China; Project(02ZE14054) supported bythe Natural Science Foundation of Shanghai; China

摘　　要：The microstructure of an explosively compacted Nd-Fe-B permanent magnet（Nd-Fe-B） was investigated by means of TEM and XRD. It is shown that there are three kinds of phases: Nd2Fe14B matrix phase, O-rich phases and Nd-rich phase with different structures and compositions in the magnet. The hard magnetic phase Nd2Fe14B is tetragonal, which lattice parameters are determined to be a=0.88 nm and c=1.22 nm. The O-rich phase locates at the grain boundaries and the triple junctions has fcc structure whose lattice parameter is a=0.559 nm. A dislocation is observed in this phase. It is also found that a large number of the block-shaped Nd-rich phases with hcp structure are embedded in the Nd2Fe14B matrix or at grain boundary. Their lattice parameters are determined to be a=0.395 nm and c=0.628 nm.The microstructure of an explosively compacted Nd-Fe-B permanent magnet(Nd-Fe-B) was investigated by means of TEM and XRD. It is shown that there are three kinds of phases: Nd_2Fe_(14)B matrix phase, O-rich phases and Nd-rich phase with different structures and compositions in the magnet. The hard magnetic phase Nd_2Fe_(14)B is tetragonal, which lattice parameters are determined to be a=0.88 nm and c=1.22 nm. The O-rich phase locates at the grain boundaries and the triple junctions has fcc structure whose lattice parameter is a=0.559 nm. A dislocation is observed in this phase. It is also found that a large number of the block-shaped Nd-rich phases with hcp structure are embedded in the Nd_2Fe_(14)B matrix or at grain boundary. Their lattice parameters are determined to be a=0.395 nm and c=0.628 nm.

关 键 词：边界相 微结构 钕-铁-硼永磁材料 爆炸压实工艺 

分 类 号：TM273[一般工业技术—材料科学与工程]