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根据用原子力显微镜对在不同温度下晶化的Fe基非晶合金薄带三维介观结构的观察,结合X射线衍射、Mssbauer谱等前人已有的实验结果并在目前已有的理论研究基础上,对Fe基非晶合金薄带在不同温度下的晶化过程进行了系统的分析、研究,提出了两种Nb-B框架介观结构、团聚相和单位体积纳米晶粒平均数等新概念,建立了Fe基纳米晶合金的晶化机理假说,提出了描述Fe基非晶合金晶化过程的介观织构模型.这个模型能够演化成二相结构模型和三相互套结构模型,还可以合理地解释现有的实验结果以及500—600℃退火中Fe基纳米晶巨磁阻抗比率最大值变化明显的原因.
According to the observation of the three-dimensional mesoscopic structure of the Fe-based amorphous alloy ribbons crystallized at different temperatures by atomic force microscopy, combined with the existing experimental results of X-ray diffraction and Mssbauer spectroscopy, and based on the existing theoretical research , The crystallization process of Fe-based amorphous alloy ribbons at different temperatures was systematically analyzed and studied. Two new Nb-B framework mesostructures, agglomeration phases and the average number of nanocrystals per unit volume were proposed Concept, the hypothesis of crystallization mechanism of Fe-based nanocrystalline alloy has been established and a mesoscopic texture model describing the crystallization process of Fe-based amorphous alloy has been proposed. This model can evolve into a two-phase structure model and a three-phase mutual structure model. It is reasonable to explain the existing experimental results and the reason why the maximum value of the giant magnetoresistance ratio of Fe-based nanocrystals changes obviously during annealing at 500-600 ℃.