Abstract We propose a new electron backscatter diffraction (EBSD) indexing approach that can handle overlapping patterns arising from fine-scale mixtures of two crystallographically distinct but related phases. The approach relies on a combination of spherical indexing (SI) with an overlap master pattern (OMP) in which the two phases have the proper orientation relation. We illustrate the approach using a Ti-10-2-3 sample and compare results from traditional Hough-based indexing of the α and β-phases with SI maps. We show that the SI approach produces superior orientation maps, and we present a symmetry-based algorithm for the determination of the α-phase variant when experimental patterns are indexed with respect to the OMP. We illustrate the use of the OMP to determine the parent β-phase volume fraction and obtain excellent agreement with Thermo-Calc phase fraction predictions.

中文翻译：

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取向相关相的重叠 EBSD 模式的球面索引——在钛中的应用

摘要 我们提出了一种新的电子背散射衍射 (EBSD) 索引方法，该方法可以处理由两种晶体学不同但相关的相的精细混合产生的重叠图案。该方法依赖于球形分度 (SI) 与重叠主模式 (OMP) 的组合，其中两个阶段具有适当的方向关系。我们使用 Ti-10-2-3 样本来说明该方法，并将传统的基于霍夫的 α 和 β 相索引与 SI 映射的结果进行比较。我们展示了 SI 方法产生了优越的方向图，并且我们提出了一种基于对称性的算法，用于在实验模式相对于 OMP 进行索引时确定 α 相变体。