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金属学报  1991 

Nb对(Nd,Dy)-(Fe,Co)-B永磁体显微组织的影响

, PP. 120-124

Keywords: 稀土永磁,NdFeB,显微组织

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Abstract:

用金相显微镜、扫描电镜分析了(Nd,Dy)-(Fe,Co)-B稀土永磁体加入Nb后显微组织的变化.结果表明,加入Nb后出现了板条状Fe_2Nb相和沉淀粒子相,且二者数量均随Nb量增加而增加.烧结时,φ相晶内的Fe_2Nb发生部分固溶,晶界的Fe_2Nb可机械阻碍晶粒长大.在时效时,φ相内固溶的Nb发生沉淀析出,晶界附近固溶的Nb扩散到富Nd相内形成新的含Nb粒子和增加富Nd相内的Nb含量。

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