Scanning Precession Electron Diffraction Study of 2xxx Series Aluminium Alloys Exhibiting Several Coexisting Strengthening Phases
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- Institutt for fysikk 
Throughout this thesis, scanning precession electron diffraction is applied to heat-treated Al-Cu-Li and Al-Mg-Cu-Ag alloys, shedding light on the distribution of phases present and the complex interplay between these microstructural features. The employed technique yielded high quality data sets, which through subsequent data processing enabled a detailed phase mapping of these multi-component Al alloys. Among the main results presented, are virtual dark field images highlighting all separate orientations of individual main strengthening precipitates in several low-order Al zone-axes. In addition, high spatial resolution orientational mappings of Al-Cu-(Mn,Fe) dispersoids have been obtained through diffraction pattern indexing. The obtained mappings achieve high reliability indices, and experimentally confirm the 10-fold rotation-twinned substructure of these particles.