添加镝对钕铁硼磁体力学性能与晶界改性研究  

Mechanical Properties and Grain Boundary Modification of NdFeB Magnet by Addition Dysprosium

作　　者：刘祚时[1] 钟尚江 袁大伟 周头军 Liu Zuoshi;Zhong Shangjiang;Yuan Dawei;Zhou Toujun(School of Mechanical and Elec-trical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《中国稀土学报》2019年第6期667-672,I0001,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(71361014)资助

摘　　要：由于NdFeB磁体热稳定性和力学性能较差,在服役过程中容易失效,限制了磁体的应用范围。通过探究Dy添加对磁体的力学性能和微观结构的影响,发现添加重稀土Dy后,磁体的磁性能和力学性能得到提升,晶界分布更加连续,厚度变宽,能有效阻碍裂纹的扩展。对主相和晶界相成分分析发现:Dy更容易进入主相,在晶界位置处发现富钕相有些呈现灰色,该位置处Dy,Fe明显增多,使晶界强度得到增强;对今后工业应用的设计,有一定的指导意义。Due to the poor thermal stability and mechanical properties of NdFeB magnet,which limits the application scope of the magnet.The effect of Dy element addition on the mechanical properties and microstructure of magnets was investigated.The results showed that the magnetic properties and mechanical properties were improved after adding Dy.Grain boundary distribution was more continuous and wider.Crack propagation was effectively prevented.Composition analysis of the main phase and grain boundary phase showed that Dy was more likely to enter the main phase,and the neodymium-rich phase was found to be gray at the grain boundary,where Dy and Fe elements increased significantly,enhancing the grain boundary strength.It has certain guiding significance to the design of industrial application in the future.

关 键 词：NDFEB磁体 力学性能 Dy元素 晶界 

分 类 号：TM273[一般工业技术—材料科学与工程]