High-energy diffraction microscopy (HEDM) in-situ mechanical testing experiments offer unique insight into the evolving deformation state within polycrystalline materials. These experiments rely on a sophisticated analysis of the diffraction data to instantiate a 3D reconstruction of grains and other microstructural features associated with the test volume. For microstructures of engineering alloys that are highly twinned and contain numerous features around the estimated spatial resolution of HEDM reconstructions, the accuracy of the reconstructed microstructure is not known. In this study, we address this uncertainty by characterizing the same HEDM sample volume using destructive serial sectioning (SS) that has higher spatial resolution. The SS experiment was performed on an Inconel 625 alloy sample that had undergone HEDM in-situ mechanical testing to a small amount of plastic strain (~ 0.7%), which was part of the Air Force Research Laboratory Additive Manufacturing (AM) Modeling Series. A custom-built automated multi-modal SS system was used to characterize the entire test volume, with a spatial resolution of approximately 1 µm. Epi-illumination optical microscopy images, backscattered electron images, and electron backscattered diffraction maps were collected on every section. All three data modes were utilized and custom data fusion protocols were developed for 3D reconstruction of the test volume. The grain data were homogenized and downsampled to 2 µm as input for Challenge 4 of the AM Modeling Series, which is available at the Materials Data Facility repository.

高能衍射显微镜 (HEDM) 原位机械测试实验提供了对多晶材料内不断演变的变形状态的独特见解。这些实验依赖于对衍射数据的复杂分析，以实例化与测试体积相关的晶粒和其他微观结构特征的 3D 重建。对于高度孪晶的工程合金的微观结构，在 HEDM 重建的估计空间分辨率周围包含许多特征，重建微观结构的准确性是未知的。在这项研究中，我们通过使用具有更高空间分辨率的破坏性连续切片 (SS) 来表征相同的 HEDM 样本体积来解决这种不确定性。SS 实验是在 Inconel 625 合金样品上进行的，该合金样品已经过 HEDM 原位机械测试，具有少量塑性应变（~ 0.7%），这是空军研究实验室增材制造 (AM) 建模系列的一部分。定制的自动化多模态 SS 系统用于表征整个测试体积，空间分辨率约为 1 µm。在每个切片上收集落射照明光学显微镜图像、背散射电子图像和电子背散射衍射图。使用了所有三种数据模式，并为测试体积的 3D 重建开发了自定义数据融合协议。将晶粒数据均质化并下采样到 2 µm，作为 AM 建模系列挑战 4 的输入，可在材料数据设施存储库中获得。