| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Ultrahigh Strength in Al-AlxGey Eutectics |
| Author(s) |
Arkajit Ghosh, Wenqian Wu, Jian Wang, Amit Misra |
| On-Site Speaker (Planned) |
Arkajit Ghosh |
| Abstract Scope |
Laser rapid solidified Al-Ge cast eutectic alloy produces lamellar nano-eutectic composite microstructures having Al-rich FCC soft phases with coherent Al(Ge) precipitates and AlxGey intermetallic hard phases with two different metastable monoclinic crystal structures depending on composition and cooling rate. These nanoscale eutectics exhibited high hardness of ~4 GPa, and compressive flow strength of up to ~1.2 GPa with significant plastic deformability. The key strengthening mechanisms are (i) stacking faults in the Al-rich phases in presence of the precipitates, and (ii) confined layer slip in nanoscale Al channels. The hard AlxGey intermetallic phases exhibited cracking with no measurable plasticity. Significant detwinning of the process-induced nanotwins in one of the metastable intermetallic phases was shown to prolong softening during compression, unlike the other intermetallic that did not exhibit solidification instigated twins. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Composites, Mechanical Properties |