Growth of β intermetallic in an Al-Cu-Si alloy during directional solidification via machine learned 4D quantification

Research output: Contribution to journalArticle


  • A. Kao
  • P.d. Lee
  • E. Boller
  • A.b. Phillion
  • K. Pericleous

Colleges, School and Institutes


Fe contamination is a serious composition barrier for Al recycling. In Fe-containing Al-Si-Cu alloy, a brittle and plate-shaped β phase forms, degrading the mechanical properties. Here, 4D (3D plus time) synchrotron X-ray tomography was used to observe the directional solidification of Fe-containing Al-Si-Cu alloy. The quantification of the coupled growth of the primary and β phase via machine learning and particle tracking, demonstrates that the final size of the β intermetallics were strongly influenced by the solute segregation and space available for growth whereas the β orientation was controlled by the temperature gradient direction. The work can be used to validate predictive models.


Original languageEnglish
Pages (from-to)29-33
Number of pages5
JournalScripta Materialia
Early online date15 Feb 2019
Publication statusPublished - May 2019


  • 4D imaging, Al alloys, Intermetallics, Synchrotron X-ray tomography