He Ruijun, Zhang Hongye, Liu Zhanwei, Wen Huihui, Xie Huimin
Appl Opt. 2022 Jan 10;61(2):563-569. doi: 10.1364/AO.445063.
Interface plays an important role in determining several properties in multiphase systems. It is also essential for the accurate measurement of the interface structure in a single crystal Ni-based superalloy (SCNBS) under different conditions. In this work, a subpixel accuracy transform method is introduced in detail to measure SCNBS lattice spacing at high temperatures. An intensity ratio analysis based on a high-resolution transmission electron microscopy image is employed for SCNBS interface width analysis. In this particular sample, the interface width is about 2 nm. The evolution of the lattice spacing of an ordered phase and a solid solution matrix is also obtained at high temperatures. The lattice misfit between the matrix phase and the precipitation increases with the temperature, with values of -0.39 and -0.21 at 20°C and 600°C. In addition, the coefficient of the SCNBS thermal expansion at high temperatures is discussed.
界面在决定多相系统的多种性质方面起着重要作用。对于在不同条件下准确测量单晶镍基高温合金（SCNBS）中的界面结构也至关重要。在这项工作中，详细介绍了一种亚像素精度变换方法，用于测量高温下SCNBS的晶格间距。基于高分辨率透射电子显微镜图像的强度比分析用于SCNBS界面宽度分析。在这个特定样品中，界面宽度约为2nm。还获得了高温下有序相和固溶体基体晶格间距的演变情况。基体相和析出相之间的晶格错配随温度升高而增加，在20°C和600°C时的值分别为-0.39和-0.21。此外，还讨论了SCNBS在高温下的热膨胀系数。
