An approach for the crystallographic mapping of two-phase alloys on the nanoscale using a combination of scanned precession electron diffraction and open-source python libraries is introduced in this paper. This method is demonstrated using the example of a two-phase α/β titanium alloy. The data were recorded using a direct electron detector to collect the patterns, and recently developed algorithms to perform automated indexing and analyse the crystallography from the results. Very high-quality mapping is achieved at a 3 nm step size. The results show the expected Burgers orientation relationships between the α laths and β matrix, as well as the expected misorientations between α laths. A minor issue was found that one area was affected by 180° ambiguities in indexing occur due to this area being aligned too close to a zone axis of the α with twofold projection symmetry (not present in 3D) in the zero-order Laue Zone, and this should be avoided in data acquisition in the future. Nevertheless, this study demonstrates a good workflow for the analysis of nanocrystalline two- or multi-phase materials, which will be of widespread use in analysing two-phase titanium and other systems and how they evolve as a function of thermomechanical treatments.

中文翻译：

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使用扫描进动电子衍射和开源软件库进行纳米分辨率 α-β 钛合金晶体学绘图的方法

本文介绍了一种结合扫描进动电子衍射和开源 Python 库在纳米尺度上绘制两相合金晶体学图的方法。该方法以两相 α/β 钛合金为例进行了演示。使用直接电子探测器收集图案来记录数据，最近开发了算法来执行自动索引并根据结果分析晶体学。以 3 nm 步长实现非常高质量的映射。结果显示了 α 板条和 β 矩阵之间预期的 Burgers 方向关系，以及 α 板条之间的预期错误方向。发现一个小问题，一个区域在索引中受到 180° 模糊的影响，因为该区域与零阶劳厄区中具有双重投影对称性（不存在于 3D 中）的 α 的区域轴太接近，在以后的数据采集中应该避免这种情况。尽管如此，这项研究展示了分析纳米晶两相或多相材料的良好工作流程，该工作流程将广泛用于分析两相钛和其他系统以及它们如何随着热机械处理而演变。