|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||Atomistic, Experimental and Simulation Investigation on the Modification of Al-Si Alloys
||Jiehua Li, Peter Schumacher
|On-Site Speaker (Planned)
Modifying eutectic Si from flake-like to fibrous is a key factor to improve the properties of Al-Si alloys. A detailed atomistic experimental and simulation investigation on the modification of Al-Si alloys is still of great necessity. In this contribution, high resolution scanning transmission electron microscopy high angle annular dark field imaging and electron energy loss spectroscopy as well as atom probe tomography was used to elucidate the distribution of modifying elements within eutectic Si and at the interface between eutectic Al and eutectic Si. Density functional theory calculation was also performed to elucidate the bonding behaviour of modifying elements within Si twins and its effect on the Si twinning. This investigation not only demonstrates, for the first time, a direct experimental support to the well-accepted impurity-induced twinning mechanism and the poisoning of the twin plane re-entrant edge mechanism, but also provides a full picture about the behaviour of modifying elements.