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.594 北京科技大学学报 第29卷 333 330 333 (101) (110 1110 111 0010020030040057 006 (0i1) Nd,Fe B:hk/Fe:(hk/) 图8柱状歧化组织再复合后的歧化区域和再复合区域的界面衍射花样及相应的标定 Fig.8 Diffraction patterns and accordingly indexing of the interface of disproportionation and recombination microstructure after recombination treatment 上述结果表明，具有柱状结构的吸氢歧化相之 alloy.IEEE Trans Magn.1990.26(5):9 间、歧化相与脱氢再复合相之间所具有的一定的晶 [3]Nakayama R.Takeshita T.Microstructure and crystallographic orientation of crystalline grains in anisotropic NdFeCoB (Ga or 体学位向关系，作为各向异性的传递方式，将铸态材 Zr)magnet powders produced by the HDDR process.J Appl 料的各向异性传递给了经HDDR处理后的NdFeB Phys,1994,76:412 材料，因此，提高铸态织构和改进HDDR工艺控制 [4]Harris I R.The use of hydrogen in the production of NdFeB type magnets and in the assessment of NdFeB alloys and permanent 将有助于提高粘结磁体的各向异性和磁性能 magnets//Proe 12th Int Workshop on RE Magnet and Their Ap plications.Canberra.1992:347 3结论 [5]Nakamura H.Suefuji F,Sugumata S.et al.Effect of HDDR treatment condition on magnetic property of NdFeB anisotropy HDDR各向异性NdFeB材料的各向异性来源 powder.J Appl Phys.1994.76:6828 于铸态组织，而柱状歧化组织作为各向异性的传递 [6]Nakamura H.Suefuji R.Book D.et al.Microstructural changes 介质，以位向关系的方式，将各向异性由铸态粉末传 in NdaFelB permanent magnet alloys during HDDR phenomena. Mater Trans JIM.1996.37(3):482 递到经HDDR处理后的NdFeB粉末.通过提高铸 [7]Actis F A,Nagel H A.Cohen G R.et al.Critical parameters for 态织构和改进HDDR工艺控制将有助于提高粘结 HDDR processing in NdFeB alloys//Proc 14th Int Workshop on 磁体的各向异性和磁性能， RE Magnet and Their Applications.Dresden,1996:174 参考文献 [8]Tomida T.Sano N.Hanafusa K,et al.Intermediate hydrogena- tion phase in the HDDR process of NdzFeB-based anisotropic [1]TakeshitaT,Nakayama R.Magnetic property and microstructure magnets.Acta Mater,1999.47(3):875 of NdFeB magnet powder produced by hydrogen treatment/Proe [9]韩景智，孙爱芝，刘涛，等.HDDR三元NFB各向异性材料 10th Int Workshop on RE Magnet and Their Applications.Ky- 的制备.北京科技大学学报，2002,24：137 ota,1989:551 [10]何叶青，熊科，高学绪，等，NdFB铸锭晶体生长特征，金属学 [2]Harris I R.Magnetic properties and anisotropy of NdsFe7s.Bs.Zro. 报，1999,35(3)：271 Mechanisms of producing anisotropy in NdFeB material during HDDR process SUN Aizhi),HANG Jingzhi),ZHANG Tao,SU Guangchun),TONG Chengli) 1)Materials Science and Engineering School.University of Science and Technology Beijing.Beijing 100083.China 2)School of Physics,Peking University,Beijing 100871.China ABSTRACI The microstructure,magnetic property and anisotropic mechanism of NdFeB as-cast powder and the material in different HDDR treatment stages were investigated.It is found that the anisotropy of NdFeB as- cast powder is greater than that of HDDR NdFeB materiacs.The anisotropy of HDDR NdFeB material decreases monotonously and finally disappears with the disproportionation time prolonging,which means that the anisotropy of HDDR NdFeB material originates from as-cast texture.Short disproportionation time is helpful for the anisotropy attainment.As an anisotropy passing medium,the disproportionation lamella microstructure transfers the anisotropy of as-cast powder to the final HDDR NdFeB material by means of crystallographic orien- tation. KEY WORDS NdFeB:HDDR:anisotropy;disproportionation treatment图8 柱状歧化组织再复合后的歧化区域和再复合区域的界面衍射花样及相应的标定 Fig．8 Diffraction patterns and accordingly indexing of the interface of disproportionation and recombination microstructure after recombination treatment 上述结果表明具有柱状结构的吸氢歧化相之 间、歧化相与脱氢再复合相之间所具有的一定的晶 体学位向关系作为各向异性的传递方式将铸态材 料的各向异性传递给了经 HDDR 处理后的 NdFeB 材料．因此提高铸态织构和改进 HDDR 工艺控制 将有助于提高粘结磁体的各向异性和磁性能． 3 结论 HDDR 各向异性 NdFeB 材料的各向异性来源 于铸态组织而柱状歧化组织作为各向异性的传递 介质以位向关系的方式将各向异性由铸态粉末传 递到经 HDDR 处理后的 NdFeB 粉末．通过提高铸 态织构和改进 HDDR 工艺控制将有助于提高粘结 磁体的各向异性和磁性能． 参 考 文 献 ［1］ Takeshita TNakayama R．Magnetic property and microstructure of NdFeB magnet powder produced by hydrogen treatment∥Proc 10th Int Workshop on RE Magnet and Their Applications．Kyota1989：551 ［2］ Harris I R．Magnetic properties and anisotropy of Nd16Fe75∙9B8∙0Zr0∙1 alloy．IEEE Trans Magn199026（5）：9 ［3］ Nakayama RTakeshita T．Microstructure and crystallographic orientation of crystalline grains in anisotropic NdFeCoB （Ga or Zr） magnet powders produced by the HDDR process．J Appl Phys199476：412 ［4］ Harris I R．The use of hydrogen in the production of NdFeB type magnets and in the assessment of NdFeB alloys and permanent magnets∥Proc12th Int Workshop on RE Magnet and Their Applications．Canberra1992：347 ［5］ Nakamura HSuefuji FSugumata Set al．Effect of HDDR treatment condition on magnetic property of NdFeB anisotropy powder．J Appl Phys199476：6828 ［6］ Nakamura HSuefuji RBook Det al．Microstructural changes in Nd2Fe14B permanent magnet alloys during HDDR phenomena． Mater Trans JIM199637（3）：482 ［7］ Actis F ANagel H ACohen G Ret al．Critical parameters for HDDR processing in NdFeB alloys∥Proc14th Int Workshop on RE Magnet and Their Applications．Dresden1996：174 ［8］ Tomida TSano NHanafusa Ket al．Intermediate hydrogenation phase in the HDDR process of Nd2Fe14B－based anisotropic magnets．Acta Mater199947（3）：875 ［9］ 韩景智孙爱芝刘涛等．HDDR 三元 NdFeB 各向异性材料 的制备．北京科技大学学报200224：137 ［10］ 何叶青熊科高学绪等NdFeB 铸锭晶体生长特征．金属学 报199935（3）：271 Mechanisms of producing anisotropy in NdFeB material during HDDR process SUN A iz hi 1）HA NG Jingz hi 2）ZHA NG T ao 1）SU Guangchun 1）TONG Chengli 1） 1） Materials Science and Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China 2） School of PhysicsPeking UniversityBeijing100871China ABSTRACT The microstructuremagnetic property and anisotropic mechanism of NdFeB as-cast powder and the material in different HDDR treatment stages were investigated．It is found that the anisotropy of NdFeB ascast powder is greater than that of HDDR NdFeB materiacs．The anisotropy of HDDR NdFeB material decreases monotonously and finally disappears with the disproportionation time prolongingwhich means that the anisotropy of HDDR NdFeB material originates from as-cast texture．Short disproportionation time is helpful for the anisotropy attainment．As an anisotropy passing mediumthe disproportionation lamella microstructure transfers the anisotropy of as-cast powder to the final HDDR NdFeB material by means of crystallographic orientation． KEY WORDS NdFeB；HDDR；anisotropy；disproportionation treatment ·594· 北 京 科 技 大 学 学 报 第29卷