About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Microstructural Evolution and Deformation Behavior during Uniaxial Compression of Al-Si Alloys |
| Author(s) |
Tingkun Liu, Matthew Olszta, Bharat Gwalani, Changyong Park, Arun Devaraj |
| On-Site Speaker (Planned) |
Tingkun Liu |
| Abstract Scope |
In-situ synchrotron X-ray diffraction of Al-Si was performed using a diamond anvil cell (DAC) to explore the microstructural evolution and deformation of alloys under uniaxial compression. The results show the transformation of Si follows Si-I Si-XI Si-V in Al-4Si, while the Si-I phase directly transforms to Si-V in Al-1Si during compression. The Si-III phase was observed after the pressure released. Site-specific transmission and scanning transmission (S/TEM) analysis of the surface in contact with the diamond anvil was also performed, showing unique morphologies including a narrow region of amorphous aluminum oxide interspersed with nano-dimension crystalline Al and Si. Most interestingly, a complex intermediate interface was discovered between the faceted Si-I and the interior Si-III in Al-1Si. It is comprised of a small fraction of Al nanocrystals and a majority nanocrystalline Si-I. A minor fraction of the Al/Si interface is composed of the Si-III grains contacting the Al matrix. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Other |