About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
|
| Presentation Title |
MICROSTRUCTURALLY DEFECT INDUCED HIGH STRAIN-RATE FAILURE MODES IN REFRACTORY ALLOYS |
| Author(s) |
Omar Eldaly, Mohammed A. Zikry |
| On-Site Speaker (Planned) |
Omar Eldaly |
| Abstract Scope |
The major objective of this investigation is to fundamentally understand and predict how intergranular (IG) and transgranular (TG) fracture modes nucleate and propagate in niobium and tungsten polycrystalline systems due to defects, such as total and partial dislocation densities, dislocation-density junctions, grain boundary (GB) structures, and misorientations. A dislocation density crystalline plasticity (DCP) formulation based on the evolution and interaction of total and partial dislocation densities was integrated with a recently developed fracture approach to investigate the fracture nucleation and propagation of simultaneous multiple fracture events, including both IG and TG fracture events in refractory alloys subjected to high strain-rates and temperatures. The validated predictions indicate that dislocation density pileups induce IG fracture, and that TG fracture occurred due to normal stress accumulations, which exceeds the fracture stress along cleavage planes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, ICME, Mechanical Properties |