【作者】 杨森； 王献辉； 孙占波； 宋晓平；

【Author】 YANG Sen;WANG Xian-hui;SUN Zhan-bo;SQNG Xiao-ping Dcpartment of Physical Materials, School of Science Xi’an Jiaotong University Xi’an, 710049, China

【机构】 西安交通大学理学院材料物理系；

【摘要】 富Nd相在烧结NdFeB 稀土永磁体性能方面起着重要的作用。本文用Fe₁₈Nd₈₂二元合金来模拟实际烧结NdFeB 磁体中的富Nd相,并研究了添加W、Mo 合金元素对Fe₁₈Nd₈₂二元合金显微组织的影响和这些元素在合金中的分布。结果表明,Fe₁₈Nd₈₂二元合金组织为先共晶α-Nd相和α- Nd+ Nd₂Fe₁₇共晶组织组成。在合金中添加W,Mo 元素后,显微组织发生明显变化,先共晶α-Nd 相数量减少,共晶组织增多。微区成分分析表明,W,Mo 进入共晶体中的Nd₂Fe₁₇相中。实际NdFeB 磁体中W,Mo 合金元素对矫顽力的提高作用可归结为高温时新相W,Mo-Fe-B 的生成。更多还原

【Abstract】 Nd-rich phase plays a key role in the sintered NdFeB permanent magnets. Fe₁₈Nd₈₂ binary alloys, whichsimulate Nd-rich phase in the sintered NdFeB magnets, are smelted. The microstructures of Fe₁₈Nd₈₂ binary alloys andW,Mo element-added alloys have been investigated. Results show that the microstructures of binary alloy Fe₁₈Nd₈₂ areconsisted of (-Nd phase and eutectic structure ((-Nd+ Nd₂Fe₁₇). With W and Mo element adding, the quantities of (-Ndphase decrease, whereas the quantities of eutectic structure increase. EDX shows that W,Mo elements enter into thelaminated eutectic Nd₂Fe₁₇ phase. The coercivity improvement of W,Mo-added NdFeB magnets contributes to theoccurrence of W,Mo-Fe-B new phase.更多还原