| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Solid Phase Processing Symposium
|
| Presentation Title |
MD Simulations of Deformation Mechanisms and Sub-grain Formation in Al-Si Alloys Under High Shear Deformation |
| Author(s) |
Shenyang Hu, Suveen Mathaudhu, Nanjun Chen |
| On-Site Speaker (Planned) |
Shenyang Hu |
| Abstract Scope |
Solid phase processing (SPP) methods such as Shear Assisted Processing and Extrusion (ShAPE) have been emerging a powerful material fabrication technique. Through SPP, alloys can be fabricated, that would be difficult-to-impossible to be produced via conventional processing methods due to chemical incompatibilities in the melt. Furthermore, unique microstructures and material properties in semi-fabricated products are not attainable through melt/solidification processing. During the SPP, high shear strains and elevated local temperature are induced which drive the material away-from equilibrium and result in the formation of metastable and/or unstable structures. The metastable structures ultimately affect the phase stability, microstructure evolution, and material properties. However, the mechanisms of deformation and metastable structure formation during SPP is not well understood. In this work, we employ molecular dynamics method to investigate the effect of initial microstructures and operation conditions on dislocation structure evolution and phase stability in polycrystalline Al-Si alloys under high shear deformation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |