HDDR钕铁硼材料各向异性产生的机制  

Mechanisms of producing anisotropy in NdFeB material during HDDR process

作　　者：孙爱芝[1] 韩景智[2] 张涛[1] 苏广春[1] 仝成利[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京大学物理学院,北京100871

出　　处：《北京科技大学学报》2007年第6期591-594,共4页Journal of University of Science and Technology Beijing

基　　金：国家"863"计划资助项目(No.2003AA32G020)

摘　　要：研究了NdFeB铸态粉末及HDDR工艺处理过程中不同阶段材料的显微结构、磁性能和各向异性产生的机理.发现NdFeB铸态粉末的各向异性均大于HDDR NdFeB材料的各向异性.随歧化时间延长HDDR NdFeB材料的各向异性单调下降,最终消失,说明HDDR NdFeB材料的各向异性来源于对铸态粉末各向异性的继承;短时间的歧化处理有助于材料获得各向异性;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了经HDDR处理后的NdFeB粉末.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 orientation.

关 键 词：NDFEB HDDR工艺 各向异性 歧化处理 

分 类 号：TG132.2[一般工业技术—材料科学与工程]