• Maclaren, Ian
• Ophus, Colin
• Zeltmann, Steven
• Frutosmyro, Enrique

Abstract

<jats:title>Abstract</jats:title><jats:p>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.</jats:p>

Topics

• impedance spectroscopy
• phase
• electron diffraction
• titanium
• titanium alloy
• aligned