In-Situ Reversed Deformation Experiments in the High-VoltageTransmission Electron Microscope

本建议研究金属单晶的疲劳过程 用透射电镜观察位错 动力学 研究者计划原位反向变形 高压透射电子显微镜实验 （HVEM）。 设计了一种独特的装载工具， 在应力反向下试样的屈曲，通常是一个问题 遇到这种类型的测试。 疲劳过程和 在应变反转期间， 相对较厚的箔，以提供对基本的见解， 疲劳的性质和相关的鲍辛格效应。 %%% 这项研究为观察疲劳提供了新的能力。 在金属合金中加工。 该技术应允许观察 位错的运动范围很大， 为疲劳过程提供了新的见解。

This proposal examines the fatigue process in metal single crystals using transmission electron microscopy to observe dislocation dynamics. The investigator plans in-situ reverse deformation experiments in a high voltage transmission electron microscope (HVEM). A unique loading instrument has been devised to avoid buckling of the specimens under stress reversal, a problem normally encountered with this type of test. The fatigue process and associated dislocations are imaged during strain reversals in relatively thick foils to provide insights into the fundamental nature of fatigue and related Bauschinger effects. %%% This research offers new capabilities for observing the fatigue process in metal alloys. The technique should allow observation of the motion of dislocations over a significant range and should provide new insights to the fatigue process.