| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Analysis of Dendrite Fragmentation from Microgravity Solidification Experiments |
| Author(s) |
Zachary T. Thompson, Tiberiu Stan, Peter Voorhees, Nathalie Mangelinck-Noёl, Henri Nguyen-Thi |
| On-Site Speaker (Planned) |
Zachary T. Thompson |
| Abstract Scope |
Dendritic two-phase microstructures frequently form during the processing of metallic alloys. These microstructures can undergo several changes during solidification, including fragmentation of secondary and tertiary dendrite arms. These fragments can have a large effect on materials properties of the solidified part, notably by acting as nucleants for the formation of equiaxed grains that can lead to a columnar-to-equiaxed transition (CET). However, fragment formation can be difficult to quantify as fragments often reattach to a different portion of the primary dendrite. Fragments can also remelt due to interdendritic fluid flow. This work focuses on experiments performed in microgravity aboard the International Space Station to reduce the complicating effect of convection. The samples were returned to Earth and serial sectioned to create 3D image data, which are then used to measure the extent and distribution of fragment formation. This work produces benchmark data for understanding fragmentation and its effect on the CET. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Phase Transformations, |