Laboratory diffraction contrast tomography (LabDCT) enables the user to reconstruct three-dimensional (3D) grain maps of polycrystalline materials. For each grain, the size, orientation, and 3D morphology including the number of faces can be derived. Since the technique is non-destructive, LabDCT opens up new possibilities for studies of microstructural evolution at the level of individual grains. The LabDCT setup is integrated on a commercial X-ray microscope, enabling correlation of the resulting grain map with complimentary information on, e.g., cracks, porosities, and inclusions. Here, the LabDCT principle is introduced, and recent materials science applications are presented. The first example on liquid metal embrittlement highlights the correlation of grain boundary properties and complimentary absorption information on grain boundary wetting. It is shown that the grain boundary energy determines whether wetting occurs or not. The second example is on grain growth. The grain statistics in this study, more than 1200 grains at two different time steps, were large enough to capture rare events such as abnormal grain growth and the annihilation of a grain with only three faces.

中文翻译：

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实验室衍射对比层析成像技术在3D中对多晶材料的无损表征

实验室衍射对比断层扫描（LabDCT）使用户能够重建多晶材料的三维（3D）晶粒图。对于每个晶粒，可以导出包括面数在内的尺寸，方向和3D形态。由于该技术是非破坏性的，因此LabDCT为研究单个晶粒水平的微结构演变开辟了新的可能性。LabDCT装置集成在商用X射线显微镜上，可将生成的晶粒图与裂纹，孔隙率和夹杂物等补充信息进行关联。在这里，介绍了LabDCT原理，并介绍了最新的材料科学应用。关于液态金属脆化的第一个例子强调了晶界特性与晶界润湿性的互补吸收信息的相关性。结果表明，晶界能决定了是否发生润湿。第二个例子是谷物的生长。这项研究中的谷物统计数据（在两个不同的时间步长上有1200多个）足以捕获罕见的事件，例如异常的谷物生长和仅具有三个面的谷物的an灭。