|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Dendrite Orientation Selection and Growth Dynamics of Al-based Alloys
||Maike Becker, Stefan Klein, Matthias Kolbe, Sebastian Thomas Wiese, Florian Kargl
|On-Site Speaker (Planned)
Dendritic structures are very common in metallic metals produced by solidification. The developing grain morphologies and the growth dynamics characterize the final microstructure of an alloy. To study the evolution and growth morphologies of dendrites, we use in-situ X-ray radiography and post-mortem electron backscatter diffraction (EBSD). Real-time monitoring of the thin (< 0.5 mm) alloy samples gives information on the growth velocities of the dendrite tips and on the change of solute composition in the extra-dendritic liquid. The experimentally determined tip velocities are compared to growth models that predict dendritic tip growth. The orientations of the dendrites are analyzed post-mortem using EBSD analysis. We observe different dendrite orientations in Al-Ge and Al-Cu alloys. Dendrites in Al-Cu alloys grow along the crystallographic <100> direction, whereas dendrites in Al-Ge alloys show variable growth directions. We find an influence of germanium content on the selected dendrite orientations.
||Planned: Supplemental Proceedings volume