About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Extraordinary mechanical behavior of Al-(Si-Ge) univariant ternary nano-fibrous eutectics |
| Author(s) |
Arkajit Ghosh, Jian Wang, Amit Misra |
| On-Site Speaker (Planned) |
Arkajit Ghosh |
| Abstract Scope |
Ultrafine eutectic microstructures, such as nano-fibrous Al-Si, serve as effective model systems to investigate dislocation mechanisms that enable concurrent strength and plasticity in heterogeneous phase materials. However, cracking of the hard Si fibers remains a critical issue due to limited plastic co-deformation with the soft Al phase. To address this, we propose chemical modification of the hard phase using Ge, which exhibits complete solid solubility in Si and is hypothesized to reduce its Peierls stress. Guided by the tie-line of the Al-Si-Ge phase diagram, we synthesized univariant ternary eutectics with varying Ge content and refined them to nano-scale via laser rapid solidification. The resulting microstructures exhibit exceptional nano-mechanical properties, with enhanced plastic deformability correlating with Ge enrichment. Postmortem TEM, HR-STEM, and 4D-STEM analyses reveal the underlying deformation mechanisms, offering insight into how compositional tuning of the hard phase can overcome brittle failure in high-strength eutectic systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Solidification |