  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 alpha / beta titanium alloy. The
data was 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
3nm step size. The results show the expected Burgers orientation relationships
between the alpha laths and beta matrix, as well as the expected
misorientations between alpha laths. A minor issue was found that one area was
affected by 180{\deg} ambiguities in indexing occur due to this area being
aligned too close to a zone axis of the alpha with 2-fold 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.
