Preparation of TbCu 7 -type Sm-Fe powders by low-temperature HDDR treatment
Preparation of TbCu 7 -type Sm-Fe powders by low-temperature HDDR treatment
复制标题
低温HDDR处理制备TbCu 7 型Sm-Fe粉末
DOI：
10.1016/j.jmmm.2018.01.092
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发表时间：
2018
影响因子：
2.7
通讯作者：
K. Ozaki
中科院分区：
文献类型：
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作者：
K. Takagi;Miho Jinno;K. Ozaki
对Sm-Fe合金粉末进行低温氢歧化-解吸-复合（HDDR）处理，制备了晶粒尺寸大于几百纳米的tbcu7型亚稳Sm-Fe合金粉末。当处理温度高于700 °C时，可以生成常见的th2zn17型合金，而低于600 °C时，可以成功合成晶粒尺寸为亚微米的tbcu7型Sm-Fe合金。然而，与th2zn17型相比，tbcu7型合金粉末的磁性能没有明显改善，因为其成分估计接近smfe8.5，因此没有达到预期的富铁成分。因此，对未完成的tbcu7型合金粉末进行横断面透射电镜观察，探索富铁相的形成途径。
Low-temperature hydrogen-disproportionation-desorption-recombination (HDDR) treatment of Sm-Fe alloy powder was conducted to prepare a metastable TbCu7type Sm-Fe alloy powder with a grain size of more than a few hundreds of nanometers. While a treatment temperature above 700 °C produced the familiar Th2Zn17type alloy, one below 600 °C resulted in successful synthesis of the TbCu7type Sm-Fe alloy with submicron-size grains. This TbCu7type alloy powder, however, showed no significant improvement in magnetic properties compared to the Th2Zn17type, as its composition was estimated to be near SmFe8.5and thus did not achieve the expected Fe-rich composition. Therefore, cross-sectional transmission electron microscope observation of the unfinished TbCu7type alloy powder was conducted in order to explore means of forming the Fe-rich phase.