铸造热压变形Nd-Fe-B永磁合金显微组织和织构的研究  

Study on microstructure and magnetic texture of hot-pressing cast NdFeB permanent magnetic alloys

作　　者：计云萍[1] 闫俊萍[1] 王晓军[1] 王玉峰[1] 李文学[1] 任慧平[1] 

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010

出　　处：《包头钢铁学院学报》2004年第1期29-33,共5页Journal of Baotou University of Iron and Steel Technology

基　　金：内蒙古科技攻关项目(20020202);教育部科学技术研究重点项目(地方02031)

摘　　要：研究了铸造-热压变形Nd Fe B系永磁合金的铸锭组织特征和热压变形过程中组织与织构的变化.The microstructure features of Nd-Fe-B ingot and the influence of hot-pressing deformation on microstructure and magnetic texture of cast Nd-Fe-B pemanent magnetic alloys were studied.Results show that the growth of Nd_2Fe_(14)B grain during solidification is on sheet-like pattern.The microstructure of Nd-Fe-B ingot has great influence on producing hot-deformed Nd-Fe-B permanent magnetic materials.The molding processing should be improved in order to obtain excellent microstructure with fine and well-aligned colum Nd_2Fe_(14) grains,fine and well-proportioned distribution rich-Nd phase and without α-Fe phase.Hot-pressing deformation refines the grain,and with the increase of strain,the Nd_2Fe_(14)B grains are further refined and the crystal boundary microstructure is improved.The initial texture of Nd-Fe-B alloys is important to form magnetic texture during hot-deformatiion.The well-developed initial texture of Nd-Fe-B permanent magnets can be decreased by hot-pressing deformation,conversely hot-prssing deformation increases the magnetic texture of Nd-Fe-B permanent only when the initial texture is not strengthened.

关 键 词：NDFEB 稀土永磁 热变形 磁织构 

分 类 号：TG113.12[金属学及工艺—物理冶金]