Background: Advancements in the Digitial Image Correlation (DIC) technique over the past decade have greatly improved spatial resolution. However, many processes, such as plastic deformation, have a temporal component spanning from fractions of a second to minutes that has not yet been addressed in detail, particularly for DIC conducted in-situ in the scanning electron microscope (SEM). Objective: To develop a methodology for conducting time-resolved digital image correlation in the SEM for analysis of time-dependent mechanical deformation phenomena. Methods: Microscope and electron beam scanning parameters that influence the rate at which time-resolved DIC information is mapped are experimentally investigated, providing a guide for use over a range of timescales and resolutions. Results: Time-resolved DIC imaging is demonstrated on a Ti-7Al alloy, where slip band propagation is resolved with imaging dwell times of seconds. The limits of strain resolution and strain collection speeds are analyzed. Conclusions: The new developed methodology can be applied to a wide range of materials loaded in-situ to quantify time-dependent plastic deformation phenomena.

中文翻译：

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用于分析时变机制的扫描电子显微镜中的时间分辨数字图像相关性

背景：过去十年数字图像相关 (DIC) 技术的进步极大地提高了空间分辨率。然而，许多过程，例如塑性变形，具有从几分之一秒到几分钟的时间分量，尚未详细解决，特别是对于在扫描电子显微镜 (SEM) 中原位进行的 DIC。目标：开发一种在 SEM 中进行时间分辨数字图像相关性的方法，以分析与时间相关的机械变形现象。方法：通过实验研究影响时间分辨 DIC 信息映射速率的显微镜和电子束扫描参数，为在一系列时间尺度和分辨率上的使用提供指导。结果：在 Ti-7Al 合金上展示了时间分辨 DIC 成像，其中滑带传播是通过几秒的成像停留时间来解决的。分析了应变分辨率和应变收集速度的限制。结论：新开发的方法可以应用于各种原位加载的材料，以量化与时间相关的塑性变形现象。