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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing Modeling, Simulation and Artificial Intelligence
Presentation Title Mechanistic Understanding of Strengthening in WAAM NAB Alloys Through Dislocation Dynamics
Author(s) Ahamed Ali N, Faizan Hijazi, Jaafar El Awady
On-Site Speaker (Planned) Ahamed Ali N
Abstract Scope Nickel Aluminum Bronze (NAB) alloys are widely used in marine applications due to their exceptional strength and corrosion resistance. While these alloys are traditionally cast, Wire Arc Additive Manufacturing (WAAM) offers a promising alternative by addressing casting limitations and accelerating production. However, the complex thermo-elastoplastic conditions inherent to WAAM result in unique microstructures that differ from those formed through casting. This study investigates the fundamental deformation mechanisms in WAAM -processed NAB alloys using large-scale three-dimensional discrete dislocation dynamics (DDD) simulations. The simulations account for solute strengthening, nanoprecipitate strengthening, and grain boundary effects, focusing on how the special distribution of nanoprecipitates influences the strength of these alloys. To improve the simulation’s fidelity, the experimentally measured nanoprecipitate distributions under various conditions were incorporated. Validation is performed through in situ scanning electron microscopy (SEM) mechanical testing on WAAM-produced NAB microcrystals subjected to monotonic loading, enabling direct observation of the dislocation-precipitate interactions.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Modeling and Simulation, Computational Materials Science & Engineering

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