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
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（21）
• 页码范围: 28-35
• 页数: 8页
• 语种: 英文

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.