Registration between DCT and EBSD datasets for multiphase microstructures
Registration between DCT and EBSD datasets for multiphase microstructures
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多相微观结构的 DCT 和 EBSD 数据集之间的配准
DOI：
10.1016/j.matchar.2023.113228
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发表时间：
2023
影响因子：
4.7
通讯作者：
Ball J
中科院分区：
文献类型：
--
作者：
Ball J
对多相材料三维微观结构的模拟对于理解相之间的相互作用及其相关的材料性质是必不可少的。在这里，基于实验室的衍射对比度断层扫描（基于实验室的DCT），最近建立的材料表征技术，可以确定晶粒相，形态，位置和方向，在基于体素的重建方法，被用来映射部分的双相钢合金样品。为了评估由基于实验室的DCT技术产生的所得微观结构，在相同的样品体积内收集电子背散射衍射（EBSD）图。为了识别与2D EBSD图最佳对应的三维（3D）基于实验室的DCT重建的二维（2D）切片，开发了一种仅基于颗粒平均取向的新型配准技术-该配准技术需要很少的数据集对准的先验知识，并且可以扩展到仅恢复颗粒平均取向数据的其他技术，例如远场3D X。射线衍射显微镜一旦在基于实验室的DCT数据集中识别出相应的2D切片，就在基于实验室的DCT和EBSD技术之间进行相位平衡、粒度、形状和纹理的比较。更复杂的方面的微观结构形态，如晶界形状和晶粒小于临界尺寸的实验室为基础的DCT重建再现较差，主要是由于分辨率的技术与EBSD相比的差异。然而，基于实验室的DCT被示出为精确地确定每个相存在的大晶粒的质心位置、取向和尺寸，奥氏体和马氏体铁素体。结果揭示了一个复杂的铁素体晶粒网络的相似的晶体取向是不存在的EBSD数据集。这些细节表明，基于实验室的DCT，作为一种技术，在多相材料表征领域显示出巨大的前景。
The ability to characterise the three-dimensional microstructure of multiphase materials is essential for understanding the interaction between phases and their associated materials properties. Here, laboratory-based diffraction-contrast tomography (lab-based DCT), a recently-established materials characterization technique that can determine grain phases, morphologies, positions and orientations in a voxel-based reconstruction method, was used to map part of a dual-phase steel alloy sample. To assess the resulting microstructures produced by the lab-based DCT technique, an electron backscatter diffraction (EBSD) map was collected within the same sample volume. To identify the two-dimensional (2D) slice of the three-dimensional (3D) lab-based DCT reconstruction that best corresponded to the 2D EBSD map, a novel registration technique based solely on grain-averaged orientations was developed – this registration technique requires very little a priori knowledge of dataset alignment and can be extended to other techniques that only recover grain-averaged orientation data such as far-field 3D X-ray diffraction microscopy. Once the corresponding 2D slice was identified in the lab-based DCT dataset, comparisons of phase balance, grain size, shape and texture were performed between lab-based DCT and EBSD techniques. More complicated aspects of the microstructural morphology such as grain boundary shape and grains less than a critical size were poorly reproduced by the lab-based DCT reconstruction, primarily due to the difference in resolutions of the technique compared with EBSD. However, lab-based DCT is shown to accurately determine the centre-of-mass position, orientation, and size of the large grains for each phase present, austenite and martensitic ferrite. The results reveals a complex ferrite grain network of similar crystal orientations that are absent from the EBSD dataset. Such detail demonstrates that lab-based DCT, as a technique, shows great promise in the field of multi-phase material characterization.
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