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Analysis of both nanocrystallization and creep-induced anisotropy kinetics in Fe-Si-B-Cu-Nb alloys

机译:Fe-Si-B-Cu-Nb合金的纳米结晶和蠕变各向异性动力学分析

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摘要

Amorphous-nanocrystalline transformation in Fe_(73.5)Si_(15.5)B_7Cu_1Nb_3 is investigated by magnetostriction (λ_s) and creep-induced anisotropy measurements. Crystalline volumetric fraction, p, is checked by X-ray diffraction. The temperature dependence of magnetostriction is consistent with Herzer's dilution law. Kinetics are well described using the Johnson-Mehl-Avrami (JMA) approach with the activation energy equal to 4.5 eV. Creep-induced anisotropy is interpreted within the framework of the so-called "back stress" model. Based on these results, optimal crystalline fraction can be achieved by flash annealing. TEM imaging reveals homogeneous nanocrystallization.
机译:通过磁致伸缩(λ_s)和蠕变引起的各向异性测量研究了Fe_(73.5)Si_(15.5)B_7Cu_1Nb_3中的非晶-纳米晶转变。结晶体积分数p通过X射线衍射检查。磁致伸缩的温度依赖性与Herzer的稀释定律一致。使用Johnson-Mehl-Avrami(JMA)方法很好地描述了动力学,其活化能等于4.5 eV。蠕变引起的各向异性是在所谓的“背应力”模型的框架内解释的。基于这些结果,可以通过快速退火获得最佳的晶体分数。 TEM成像显示均匀的纳米结晶。

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