Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning
Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning
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DOI：
10.1016/j.jmmm.2009.09.054
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发表时间：
2010-02
影响因子：
2.7
通讯作者：
Duc-The Ngo;M. S. Mahmud;H. Nguyen;H. Duong;Q. Nguyen;S. McVitie;C. Nguyen
中科院分区：
文献类型：
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作者：
Duc-The Ngo;M. S. Mahmud;H. Nguyen;H. Duong;Q. Nguyen;S. McVitie;C. Nguyen
采用热分析和原位磁化动力学测量方法，系统研究了传统快淬工艺制备的非晶/纳米复合合金Fe 73.5Si 17.5B5Nb 3Cu 1的晶化过程和超软磁性能。用差示扫描量热法进行的热分析表明，从Fe基非晶态到α-Fe（Si）的晶化开始于535 ℃。进一步加热样品导致在670 ℃下从α-Fe（Si）相转变为Fe-B相。用Kissinger和John-Mehl-Avrami（JMA）两种模型计算了晶化活化能，两种模型的计算结果一致，均为2.81 ± 0.03eV。高分辨透射电子显微镜研究表明，α-Fe（Si）纳米微晶具有平均尺寸为12.5nm的超细结构，镶嵌在非晶基体中。当α-Fe（Si）相体积分数为86%时，经530 ℃、40min退火后，获得了最佳的软磁性能，磁导率为110，000，磁导率为0.015Oe。
The crystallisation process and the ultras-soft magnetic properties of amorphous/nanocomposite alloy Fe73.5Si17.5B5Nb3Cu1fabricated by conventional melt-spinning technique are systematically investigated in terms of thermal analysis and in-situ measurement of magnetisation dynamics. The thermal analysis using differential scanning calorimetry showed that crystallisation from Fe-based amorphous state to α-Fe(Si) started at 535∘C. Further heating the sample leads to a transformation from the α-Fe(Si) to Fe-B phases at 670∘C. Crystallisation activation energies were determined using two models: Kissinger and John–Mehl–Avrami (JMA), which were consistent to each other with a value of 2.81±0.03eV. High resolution transmission electron microscopy investigation revealed an ultrafine structure of α-Fe(Si) nanocrystallite with mean size of 12.5nm embedded in an amorphous matrix. At a volume fraction of 86% of α-Fe(Si) phase, optimum soft magnetic properties were obtained with very high permeability of 110,000 and a very low coercivity of 0.015Oe by annealing the amorphous alloy at 530∘C in 40min.