The disproportionated structure of Sm2Fe17 observed by high resolution scanning electron microscopy
The disproportionated structure of Sm2Fe17 observed by high resolution scanning electron microscopy
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DOI：
10.1016/0925-8388(95)02010-1
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发表时间：
1996
影响因子：
6.2
通讯作者：
J. C. Clarke;O. Gutfleisch;S. Sinan;I. R. Harris
中科院分区：
文献类型：
--
作者：
J. C. Clarke;O. Gutfleisch;S. Sinan;I. R. Harris
Nd-Fe-B合金的氢化、结晶、脱附和复合（HDDR）处理技术最近已应用于Sm_2Fe_（17）材料。其他研究人员使用透射电子显微镜研究了Sm 2Fe 17在反质子化状态下的微观结构，并表明它由α-Fe基质中直径约为20 nm的SmH 2 ± x棒组成。这里的结构的反硝化Sm 2Fe 17是由高分辨率扫描电子显微镜以及反硝化区的起始和生长到基体相。与其他人对歧化Nd 2Fe 14 B微观结构的研究进行的比较表明，这些材料是相似的。在铸态Sm_2Fe_（17）合金中，氢在α-Fe-基体界面处发生扩散反应，表明该界面是氢在合金中快速扩散的通道。这种行为可以与没有α-Fe枝晶的Nd-Fe-B材料的观察结果进行比较，其中，晶化反应显示在富Nd晶界相处开始。
The hydrogenation, disproportionation, desorption and recombination (HDDR) processing technique used with Nd-Fe-B alloys has more recently been applied to Sm2Fe17materials. Other researchers have used transmission electron microscopy to investigate the microstructure of Sm2Fe17in the disproportionated state and have shown it to consist of approximately 20 nm diameter SmH2±xrods in an α-Fe matrix. Here the structure of disproportionated Sm2Fe17is shown by high resolution scanning electron microscopy as well as the initiation and growth of disproportionated regions into the matrix phase. Comparisons with work by others on the microstructure of disproportionated Nd2Fe14B shows the materials to be similar. In as-cast Sm2Fe17the disproportionation reaction is observed to have initiated at the α-Fe-matrix interface, indicating that this interface could be a rapid diffusion path for hydrogen in this material. This behaviour can be compared with observations on Nd-Fe-B materials with no α-Fe dendrites where the disproportionation reaction is shown to be initiated at the Nd-rich grain boundary phase.