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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Microstructure-Sensitive Design and Advanced Characterization: An MPMD/SMD Symposium Honoring David T. Fullwood
Presentation Title Microstructural Failure Modes in Refractory Alloys Subjected to Extreme Environments
Author(s) Omar Eldaly, Muh-Jang Chen, 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 molybdenum polycrystalline systems due to defects, such as total and partial dislocation densities and 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. 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 Computational Materials Science & Engineering, High-Temperature Materials, ICME

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