近期兴起的高分辨率EBSD技术有优异的角分辨率(10-5rad)。本项目旨在改善基于全局集成数字图像相干的高分辨率EBSD技术，实现对多晶体材料微纳米尺度弹塑性行为的更好的表征。高分辨率EBSD可探测晶体材料的弹性变形梯度张量及其众多衍生物理量，包括弹性应变/应力、晶向角和几何必需位错(GND)密度。本项目将分析菊池图的噪声，采用最近提出的基于全局集成DIC技术，通过耦合模拟所得与实验测得的菊池图，来探究提高菊池图图案中心精度的方法，并测量样品的绝对应变/应力。该方法将首先在单晶试样上试验，对比测量值和理论值来评估其准确性。其次该方法将在多晶试样上试验，测试其在常规样品上的表征能力。本项目还将拓展高分辨率EBSD的应用范围，借助其高空间分辨率来分析微观结构更为复杂的复合材料的弹塑性行为。本项目将为探究晶体材料微纳米尺度下的弹塑性行为提供丰富的观测数据，为晶体塑性模型的发展提供实验支持。

The High-Resolution EBSD (HR-EBSD) technique developed in the last decade broadens significantly the horizon of conventional EBSD thanks to its high angular resolution (10-5rad). The present project aims at improving an experimental framework that characterizes the micro/nano-scale elasto-plastic behavior of polycrystalline materials by Integrated-DIC-based HR-EBSD. HR-EBSD measures the elastic deformation gradient tensor and its numerous derivative physical quantities including elastic strain/stress, crystallographic orientation and geometrically necessary dislocation (GND) density. It's planned to i) analyze the noise pattern of experimental electron backscattered patterns (EBSP); ii) adopt the newly proposed Integrated-DIC-based HR-EBSD to improve precision; iii) correlate simulated and experimental EBSPs to measure the absolute stress/strain; iv) propose an iterative algorithm to precisely locate the projection center of EBSP. The whole framework will first be validated on monocrystalline specimens thanks to theoretical solutions, then tested on polycrystalline specimens. Finally, the framework will be applied to composite materials of finer microstructure to test its limit, especially its spatial resolution. The framework will provide rich experimental data about elasto-plastic behavior at micro/nano-scale for the development of crystal plasticity models.