About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fracture and Deformation Across Length Scales: Celebrating the Legacy of William Gerberich
|
| Presentation Title |
Bending Hard Phases to Gerberich’s Will |
| Author(s) |
Amit Misra |
| On-Site Speaker (Planned) |
Amit Misra |
| Abstract Scope |
Professor Gerberich made seminal contributions in dislocation-mechanics based crack-tip shielding and ‘smaller is tougher’ paradigm for nanoscale brittle solids. In this presentation, dislocation mechanisms that impart plastic co-deformability in nanoscale composite microstructures of soft (Al) and hard (Si) phases will be elucidated. Glide dislocations that are blocked at soft/hard interphase boundary can be transmitted across into the hard phase or reflected back in the soft phase. The competition between these two critical unit mechanisms is analyzed using dislocation theory and atomistic modeling, resulting in maps of active mechanisms in terms of relative energy barrier for slip transmission or reflection. Nanomechanical characterization, including in situ tension in a scanning electron microscope, and scanning transmission electron microscopy are conducted on model systems of nanoscale eutectics such as Al-Si and Al-Ge. Our key findings are consistent with Gerberich’s concept of dislocating hard phases at ambient temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Nanotechnology, |