Abstract

The orientation relationship between the niobium matrix and γNb₅Si₃ silicides: [111]_Nb//[0001]_γ and (110)_Nb//(10\(\bar {1}\)0)_γ in the Nb–Si eutectic composite has been determined in this work. Within the edge-to-edge matching model, an estimation of the size misfit between the interatomic and interplanar distances of the matched phases has been made. Using direct resolution transmission electron microscopy, the structure of the interfaces between the bcc lattice of the niobium matrix and the hcp lattice of γNb₅Si₃ silicide was studied. At matched interfaces, boundary misfit dislocations, indicating a semicoherent nature of the coupling between the phases, are discovered. The step-like structure of the interphase boundary is analyzed.

中文翻译：

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Nb-Si共晶复合材料中Nb-γ-Nb5 Si 3界面的结构

摘要

铌矩阵和γNb之间的取向关系₅的Si ₃硅化物：[111]_的Nb // [0001] _γ和（110）_的Nb //（10 \（\巴{1} \） 0）_γ在Nb-Si复合共晶复合材料已在这项工作中确定。在边缘到边缘的匹配模型中，对匹配相的原子间距离和平面间距离之间的尺寸失配进行了估算。使用直接高分辨透射电子显微镜，铌基质的BCC晶格和γNb的HCP晶格之间的界面的结构₅的Si ₃研究了硅化物。在匹配的界面处，发现了边界失配位错，表明相之间耦合的半相干性质。分析了相间边界的阶梯状结构。