This work investigates the atomic scale substructure of interfaces in ZrSi secondary phase precipitates formed by the stresses associated with the α-Zr (HCP) to γ-Zr (FCC) phase transformation and thermal effects in an experimental Si-modified Zircaloy-4 by means of transmission electron microscopy and CSL/DSCL (coincident site lattice/displacement shift complete lattice) models. Analysis of a high-angle twin interface reveals their characteristic principal primary Δ vectors, a typical feature of the singular interfaces, and the sessile twinning disconnections. The step height and length of the interfacial dislocation line, with the Burgers vector parallel to the habit plane, are analysed using the DSCL model. In the second case, a low-angle interface of mixed tilt-twist character is studied and facets of constant length along the densest-packed planes and ledges of inconstant height, a common feature of vicinal interfaces, are identified.

中文翻译：

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Si 改性 Zircloy-4 中平衡的 Zr2Si 析出物中 FCC-Zr 相变诱导的缺陷亚结构

这项工作研究了实验性 Si 改性 Zircloy-4 中由 α-Zr (HCP) 到 γ-Zr (FCC) 相变相关的应力和热效应形成的 ZrSi 第二相沉淀物界面的原子尺度子结构透射电子显微镜和 CSL/DSCL（重合位点晶格/位移位移完全晶格）模型。对高角度孪晶界面的分析揭示了它们的特征主主 Δ 矢量、奇异界面的典型特征以及无柄孪晶断开。使用 DSCL 模型分析了 Burgers 矢量平行于习惯平面的界面位错线的台阶高度和长度。在第二种情况下，研究了混合倾斜扭曲特征的低角度界面，并识别了沿最密堆积平面的恒定长度的面和不恒定高度的凸缘（邻近界面的共同特征）。