Analysis on deformation and texture formation mechanism of hot-deformed Nd-Fe-B magnets based on heterogeneous structure evolution  

作　　者：Yuyang Tang Yuqing Li Xiaochang Xu Ming Yue Weiqiang Liu Hongguo Zhang Qingmei Lu Weixing Xia 

机构地区：[1]Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing,100124,China [2]Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China

出　　处：《Journal of Materials Science & Technology》2021年第21期28-35,共8页材料科学技术（英文版）

基　　金：supported by the Beijing Natural Science Foundation under Grant(2202005);the Natural Science Foundation of China(No.51331003,No.51931007);the General Program of Science and Technology Development Project of Beijing Municipal Education Commission of China under Grant(KM201710005006);the International S&T Cooperation Program of China under Grant2015DFG52020;the Program of Top Disciplines Construction in Beijing under GrantPXM2019014204500031。

摘　　要：In this paper, microstructure, micromagnetic structure, texture, together with magnetic properties of the hot-deformed(HD) Nd-Fe-B magnets were systematically studied to understand the deformation process and the formation mechanism of c-axis texture. The results show that the platelet grains are formed in the fine-grain regions at the initial stage of the deformation. As the amount of deformation increases, the proportion of platelet grains increases and arranges gradually, causing the formation of c-axis texture, till the grain merging occurres when the deformation is excessive. It should be noted that the rare earth-rich phase in the fine-grained region slowly diffuses to the coarse-grained region where only grain growth can be observed during deformation. The deformation mechanism and formation of c-axis texture in HD Nd-Fe-B magnets can be deduced to be accomplished by the processes of dissolution-precipitation diffusion, grain rotation and grain arrangement, based on the characterization of microstructure and texture evolution. Also, approaches to optimize the preparation process and magnetic properties of the hot-deformed Nd-Fe-B magnets were discussed.

关 键 词：Hot-deformed Nd-Fe-B magnet Heterogeneous microstructure Deformation mechanism C-axis texture COERCIVITY 

分 类 号：TM27[一般工业技术—材料科学与工程]