| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Oscillated Cooling Method as an Alternative Crystal Growth Route to Control the Microstructure during Peritectic Solidification |
| Author(s) |
Babak Alinejad, Alberto Castellero, Marcello Baricco |
| On-Site Speaker (Planned) |
Babak Alinejad |
| Abstract Scope |
A new mechanism is developed for preventive porosity formation in the microstructure of CoSb3 phase during peritectic solidification. Peritectic solidification involves nucleation and growth of the primary phase and formation of second phase by the reaction of the remnant liquid phase with the primary phase. The dendritic growth results in trapping of liquid phase between dendritic arms, leading to a multiphase and because of contraction of liquid, the final structure has porosity. Microstructure analysis at different stages of solidification revealed that oscillated cooling could hinder spontaneous nucleation, improve homogenous nucleation, limit the number of primary grains and impose planar growth. These factors enhance melt flux during peritectic solidification and prevent porosity formation during phase transformation contraction. By utilizing this method, dense CoSb3 single phase was obtained directly from melt in one of the most complicated solidification systems (with two peritectic transformation) in single batch process without any post treatment. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |