Abstract

This study presents the results of studying the microstructure and topological short-range atomic order in an amorphous Ti−Ni−Тa−Zr-based surface alloy formed by the additive method through pulsed electron-beam liquid-phase mixing of the “Ti₇₀Ta₃₀ film (50 nm)/Zr film (100 nm)/TiNi substrate” system. It is shown that an amorphous structure with a thickness of 2 μm is formed in the cross-section of the surface alloy and is characterized by the gradient chemical composition. It is found that the transition sublayer adjacent to the TiNi substrate has a nanocomposite crystalline structure based on the Ti₂Ni intermetallic compound. By means of the atomic radial distribution function method, using electron nanobeam diffraction data, a study of the topological short-range atomic order in the amorphous layer is performed. It is shown that the atomic structure in the amorphous surface Ti−Ni−Тa−Zr alloy has a cluster structure which can be described by the superposition of coordination polyhedra interconnected with each other by common faces corresponding to the different crystalline devitrification phases.

中文翻译：

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电子束法在TiNi基体上形成的非晶Ti-Ni-Ta-Zr基表面合金中的短程原子序的亚显微结构和特征

摘要

这项研究提出了通过脉冲电子束液相混合“ Ti ₇₀ Ta ”以加成法形成的非晶态Ti-Ni-Тa-Zr基表面合金的微观结构和拓扑短程原子序的研究结果。₃₀膜（50 nm）/ Zr膜（100 nm）/ TiNi基板”系统。结果表明，在表面合金的横截面中形成了厚度为2μm的非晶结构，其特征在于化学成分呈梯度。发现与TiNi衬底相邻的过渡子层具有基于Ti ₂的纳米复合晶体结构。镍金属间化合物。通过原子径向分布函数法，利用电子纳米束衍射数据，对非晶层中的拓扑短程原子序进行了研究。结果表明，非晶态Ti-Ni-Тa-Zr合金中的原子结构具有簇结构，该簇结构可以通过配位多面体的重叠来描述，所述多面体通过对应于不同晶体失透相的共同面相互连接。