Fe基纳米晶合金的晶化机理研究

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、Mssbauer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 关键词： Fe基纳米晶合金 晶化机理 两种Nb-B框架介观结构 团聚相

Crystallization mechanism of Fe-based nanocrystalline alloy

Based on the atomic force microscope observation of the three-dimensional mesostructure of Fe_73.5Cu₁Nb₃Si_13.5B₉ alloy ribbon annealed at different temperatures, on the basis of experimental results of X-ray diffraction and the Mssbauer spectroscopy and theoretical results for this alloy ribbon, we systematically investigate the crystallization process of this alloy ribbon annealed at different temperatures, and propose a number of new concepts, such as the mesostructure with two-kinds of Nb-B framework, the agglomeration phase of the nanocrystalline grains, and the average numbers of nanocrystalline grains in unit volume. Finally, a hypothesis of the crystallization mechanism and the mesostructure model describing the crystallization process of this alloy are established. This model can be evolved to the two- or three-phase structure model.