钕铁硼永磁晶界扩散技术和理论发展的几个问题
刘仲武, 何家毅

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LIU Zhongwu, HE Jiayi
图9 Cu的添加对烧结磁体微观组织的影响
Fig.9 Effect of Cu addition on microstructure of sintered magnets (GB—grain boundary)