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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Crystallization kinetics of Fe-B-Si metallic glasses
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Crystallization kinetics of Fe-B-Si metallic glasses

机译：Fe-B-Si金属玻璃的结晶动力学

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The crystallization processes for the amorphous metallic alloys Fe78B13Si9 and Fe81B13.5Si3.5C2 (at.%) were investigated using X-ray diffraction measurements performed in situ during Joule heating, with simultaneous monitoring of the electrical resistance. We determined the main crystalline phases formed during heating, and correlated these results to the electrical resistance variations. As the annealing current is increased, the resistance shows an initial decrease, followed by a decrease to a minimum due to nucleation and growth of alpha-Fe and FeB phases. In situ diffraction measurements also showed a metastable gamma-Fe phase, which occurs at higher temperatures. The exothermal peaks observed in the differential scanning calorimetry (DSC) corroborate the results. We have performed DSC measurements with several heating rates for each alloy, from which we determined the Avrami exponents and crystallization activation energies. The obtained activation energies (326 +/- 5 and 329 +/- 5 kJ/mol for Fe78B13Si9; 346 +/- 13, 356 +/- 11 and 558 +/- 20 kJ/mol for Fe81B13.5S13.5C2) are comparable to reported energies for amorphous iron alloys. The Avrami exponents for the Fe81B13.5Si3.5C2 alloy (n(1) = 1.3 +/- 0.1, n(2) = 1.5 +/- 0.1, n(3) = 1.3 +/- 0.2) are consistent with diffusion controlled growth of particles of appreciable initial volume (for the first and third reactions) and 3-d growth of small particles with nucleation rate close to zero (for the second reaction). The n(1) = 1.6 +/- 0.2 and n(2) = 2.0 +/- 0.1 obtained for Fe78B13Si9 reveal diffusion controlled growth of small particles with decreasing nucleation rates. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 28]
机译：使用焦耳加热过程中原位进行的X射线衍射测量研究了非晶态金属合金Fe78B13Si9和Fe81B13.5Si3.5C2（at。％）的结晶过程，同时监测电阻。我们确定了加热过程中形成的主要结晶相，并将这些结果与电阻变化相关联。随着退火电流的增加，电阻显示出最初的减小，然后由于α-Fe和FeB相的形核和生长而减小到最小。原位衍射测量还显示出亚稳态γ-Fe相，该相在较高温度下发生。在差示扫描量热法（DSC）中观察到的放热峰证实了该结果。我们对每种合金进行了几种加热速率的DSC测量，由此确定了Avrami指数和结晶活化能。所获得的活化能（Fe78B13Si9为326 +/- 5和329 +/- 5 kJ / mol; Fe81B13.5S13.5C2为346 +/- 13，356 +/- 11和558 +/- 20 kJ / mol）与报道的非晶态铁合金能量相当。 Fe81B13.5Si3.5C2合金的Avrami指数（n（1）= 1.3 +/- 0.1，n（2）= 1.5 +/- 0.1，n（3）= 1.3 +/- 0.2）与扩散控制一致初始体积明显的颗粒生长（对于第一和第三反应）和成核速率接近零的小颗粒的3-d生长（对于第二反应）。 Fe78B13Si9的n（1）= 1.6 +/- 0.2和n（2）= 2.0 +/- 0.1显示了成核速率降低的小颗粒的扩散控制生长。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：28]

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