|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Investigating the Impact of Inoculation on Al Based Alloys
||Mareike Wegener, Maike Becker, Matthias Kolbe, Florian Kargl
|On-Site Speaker (Planned)
Grain refinement in Aluminum and its alloys has been widely studied over the last years. A common method is the inoculation of the melt with Ti-B particles as heterogeneous nuclei; however the efficiency of the so-called Al-Ti-B master alloys is strongly depending on the Aluminum alloy.
We use in-situ X-ray radiography to analyze the behavior of Al5Ti1B grain refiner in Aluminum based alloys, with a focus on the system AlGe. Microstructures were analyzed post-mortem by EDX and EBSD.
Similar to AlSi alloys a poisoning effect was observed, increasing with the Germanium concentration. For a better understanding of this poisoning effect the morphology of the grain refiner particle embedded in the Al-based matrix was studied. Different stable layers of Al-Ti-B-Ge with distinct crystal structures have been found and characterized. Additionally the influence of the grain refiner on the growth morphology of the Al-dendrites was investigated.
||Planned: Supplemental Proceedings volume