采用X射线衍射分析、振动样品磁强计和差热分析研究了低温退火处理对Sm5Fe80Cu1Si5B3C2.5Zr3.5非晶合金晶化后纳米复合永磁体的组织结构、磁性能及晶化动力学的影响. 结果表明,经400 ℃低温热处理后纳米复合合金中α-Fe相和Sm2(Fe, Si)17Cx相的组织结构均产生了明显改变,晶粒尺寸分别从原始态(未经处理)的50.6 nm(α-Fe相)和20.6 nm(Sm2(Fe, Si)17Cx相)改变为36.5和24.4 nm; 体积分数分别从71.1%(α-Fe相)和28.9%(Sm2(Fe,Si)17Cx相)改变为76.7%和23.3%; 同时磁耦合性能明显增强. 晶化动力学分析发现,低温热处理增大了非晶合金的短程有序范围,改变了原始态非晶合金中α-Fe相和Sm2(Fe, Si)17Cx相的晶化行为,这是优化α-Fe/Sm2(Fe, Si)17Cx复合纳米晶结构和提高磁耦合性能的根本原因.
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