Abstract

Intermetallic phases in the Fe-Nb system have been obtained as products of the devitrification of a homogeneous amorphous Fe₇₀Nb₃₀ alloy prepared by mechanical alloying. Besides Fe₂Nb Laves and Fe₇Nb₆ intermetallic phases, α-Fe phase has been detected by X-ray diffraction (XRD). Hyperfine parameters for both Fe₂Nb and Fe₇Nb₆ intermetallics have been obtained from Mössbauer spectroscopy in correlation with phase identification from XRD results. Thermomagnetic measurements show changes in the Curie temperatures of the amorphous and Fe₂Nb phases during the crystallization, due to compositional variations related to the developing of the α-Fe phase. Kinetics of the crystallization process has been analyzed using the classical Johnson-Mehl-Avrami-Kolmogorov kinetic theory in both isothermal and non-isothermal regimes.

中文翻译：

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机械合金化Fe-Nb系统的失透作用：金属间相的Mössbauer研究

摘要

作为通过机械合金化制备的均质非晶态Fe ₇₀ Nb ₃₀合金的失透作用的产物，已经获得了Fe-Nb系统中的金属间相。除了Fe ₂ Nb Laves和Fe ₇ Nb ₆金属间相之外，还通过X射线衍射（XRD）检测到了α -Fe相。Fe ₂ Nb和Fe ₇ Nb ₆金属间化合物的超细参数已从Mössbauer光谱学中获得，并与XRD结果的相鉴别相关。热磁测量表明非晶态和Fe ₂的居里温度发生了变化由于与α -Fe相的形成有关的成分变化，在结晶过程中会形成Nb相。在等温和非等温条件下，已使用经典的Johnson-Mehl-Avrami-Kolmogorov动力学理论分析了结晶过程的动力学。