About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Microscale Mechanisms of Fatigue Damage in Wire-Arc Additive Manufactured Nickel–Aluminum Bronze from In-Situ Experiments |
| Author(s) |
Faizan Hijazi, Mostafa Omar, Mo-Rigen He, Jaafar El-Awady |
| On-Site Speaker (Planned) |
Faizan Hijazi |
| Abstract Scope |
Nickel –aluminum-bronze (NAB) alloys are widely used in naval applications for their exceptional strength and corrosion resistance. This study investigates the microscale fatigue response of wire-arc additively manufactured (WAAM) NAB under fully reversed loading, using 10×10×100 µm³ polycrystalline microcantilevers with defined crystallographic orientations. The WAAM-NAB microstructure features a Cu-rich α-matrix with inter-dendritic globular κii, lamellar κiii, and fine intragranular κiv precipitates. Microcantilevers are cyclically loaded between 0.8σy and 1.2σy within an in-situ scanning electron microscope (SEM) setup, enabling real-time monitoring of deformation and fracture. The study aims to elucidate the role of dislocation–precipitate interactions, particularly near grain and interdendritic boundaries, in governing crack nucleation and fatigue damage accumulation. Transmission electron microscopy (TEM) is employed to characterize the dislocation activity and slip behavior associated with different microstructural features. These insights are expected to enhance the understanding of cyclic deformation mechanisms in WAAM-NAB and inform the design of fatigue-resistant additive-manufactured alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Additive Manufacturing, Mechanical Properties |