About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Effect of void clustering and stress triaxiality on the ductile fracture of a high-entropy alloy |
| Author(s) |
Ahmed Ataya, Joshua Herrington, Shi-hoon Choi, Amine Benzerga |
| On-Site Speaker (Planned) |
Ahmed Ataya |
| Abstract Scope |
The ductile fracture of a high-oxygen CoCrFeMnNi high-entropy alloy is investigated. Smooth and notched round tensile bars were tested. The fracture locus exhibits decreasing strain to failure with increasing stress triaxiality. Fractography confirms that failure is dominated by microvoid nucleation at oxide inclusions, followed by growth and coalescence. Using a combination of image analysis and post-mortem measurements, the distribution of void-nucleating particles was analyzed before and after deformation. To estimate the effect of void/particle clustering against an ordered distribution, micromechanical finite element-based voided unit cell analyses were carried out after calibrating the experimental response. The strain to failure of the model compares well against the experiments at high to moderate triaxiality. The effect of void clustering proved to be prominent under low triaxiality. This analysis enables the estimation of a void clustering factor, providing a pathway to incorporate the effects of spatial distribution evolution into continuum damage models. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Modeling and Simulation, |