Two-stage-like glass transition and the glass-forming ability of a soft magnetic Fe-based glassy alloy
Two-stage-like glass transition and the glass-forming ability of a soft magnetic Fe-based glassy alloy
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DOI：
10.1063/1.3080139
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发表时间：
2009-03
影响因子：
3.2
通讯作者：
Wei Zhang;F. Jia;Xingguo Zhang;G. Xie;H. Kimura;A. Inoue
中科院分区：
文献类型：
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作者：
Wei Zhang;F. Jia;Xingguo Zhang;G. Xie;H. Kimura;A. Inoue
用X射线衍射仪、透射电子显微镜和差示扫描量热仪研究了(Fe0.9Co0.1)67.5Nb4Gd3.5B25玻璃合金的结构、热稳定性和晶化行为。热处理后，(Fe，Co)23B6纳米亚稳相在玻璃基质中析出，而类两阶段玻璃化转变消失，表明类两阶段玻璃化转变是玻璃化转变的吸热反应和过冷液相区形成(Fe，Co)23B6相的放热反应叠加的结果。(Fe0.9Co0.1)67.5Nb4Gd3.5B25玻璃合金具有较高的玻璃形成能力，可形成直径大于3.0 mm的玻璃合金棒，其饱和磁化强度较高，为0.91T，矫顽力较低，为2.5A/m，断裂强度为3870 Mpa。
The structure, thermal stability, and crystalline behavior of (Fe0.9Co0.1)67.5Nb4Gd3.5B25 glassy alloy, which exhibits a two-stage-like glass transition phenomenon, were investigated using x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The nanoscale metastable (Fe,Co)23B6 phase precipitated in the glassy matrix after annealing, while the two-stage-like glass transition disappeared, indicating the two-stage-like glass transition results from the overlap of the endothermic reaction for the glass transition with the exothermic reaction for the formation of the (Fe,Co)23B6 phase in the supercooled liquid region. The (Fe0.9Co0.1)67.5Nb4Gd3.5B25 glassy alloy exhibits high glass-forming ability, enabling the formation of glassy alloy rods with diameters exceeding 3.0 mm, rather high saturation magnetization of 0.91 T, low coercive force of 2.5 A/m, and high fracture strength of 3870 MPa.