Effects of post-sinter annealing on microstructure and magnetic properties of Nd-Fe-B sintered magnets with Nd-Ga intergranular addition

• 作者: Jin-Hao Zhu Lei Jin Zhe-Huan Jin Guang-Fei Ding Bo Zheng Shuai Guo Ren-Jie Chen A-Ru Yan
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 638-643
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abddad

摘要

We investigate the effects of post-sinter annealing on the microstructure and magnetic properties in B-lean Nd-Fe-B sintered magnets with different quantities of Nd-Ga intergranular additions.The magnet with fewer Nd-Ga additions can enhance 0.2 T in coercivity,with its remanences nearly unchanged after annealing.With the further increase of the Nd-Ga addition,the annealing process leads coercivity to increase 0.4 T,accompanied by a slight decrease of remanence.With the Nd-Ga addition further increasing and after annealing,however,the increase of coercivity is basically constant and the change of remanence is reduced.Microstructure observation indicates that the matrix grains are covered by continuous thin grain boundary phase in the magnets with an appropriate Nd-Ga concentration after the annealing process.However,the exceeding Nd-Ga addition brings out notable segregation of grain boundary phase,and prior formation of part RE6Fe13Ga phase in the sintered magnet.This prior formation results in a weaker change of remanence after the annealing process.Therefore,the diverse changes of magnetic properties with different Nd-Ga concentrations are based on the respective evolution of grain boundary after the annealing process.