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An approach for the crystallographic mapping of two-phase alloys on thenanoscale using a combination of scanned precession electron diffraction andopen source python libraries is introduced in this paper. This method isdemonstrated using the example of a two-phase alpha / beta titanium alloy. Thedata was recorded using a direct electron detector to collect the patterns, andrecently developed algorithms to then perform automated indexing and to analysethe crystallography from the results. Very high-quality mapping is achieved ata 3nm step size. The results show the expected Burgers orientationrelationships between the alpha laths and beta matrix, as well as the expectedmisorientations between alpha laths. It is found that 180{\deg} ambiguities inindexing occur due to acquisition having been performed too close to a highsymmetry zone axis of the beta with 2-fold projection symmetry (not present in3D) in the Zero Order Laue Zone for some patterns and that this should beavoided in data acquisition in the future. Nevertheless, this studydemonstrates a good workflow for the analysis of nanocrystalline two-phase ormultiphase materials, which will be of widespread use in analysing two-phasetitanium and other systems and how they evolve as a function ofthermomechanical treatments.

A method for crystallographic mapping of an alpha-beta titanium alloy  with nanometre resolution using scanning precession electron diffraction and  open-source software libraries