About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Material Responses Investigated Through Novel In-Situ Experiments and Modeling
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| Presentation Title |
Influence of Microstructural Heterogeneities on the Plastic Response of Polycrystalline Wire-Arc Additive Manufactured Ni-Al-Bronze |
| Author(s) |
Faizan Hijazi, Mo-Rigen He, Jaafar El-Awady |
| On-Site Speaker (Planned) |
Faizan Hijazi |
| Abstract Scope |
Nickel–aluminum bronze (NAB) alloys are critical to naval applications due to their superior mechanical properties and corrosion resistance. This study investigates the role of microstructural heterogeneities in governing the plasticity of wire-arc additively manufactured (WAAM) NAB. In-situ compression testing of polycrystalline micropillars, coupled with correlative EBSD, TEM, and serial sectioning, reveals that fine κiv precipitates in the α-matrix primarily influence yield behavior, while coarser κii/κiii precipitates within inter-dendritic zones (IDZs) govern strain hardening. Grain boundaries exhibit varied resistance to dislocation motion, influencing load transfer and damage accumulation. Additionally, regions enriched with Ni–Al–Fe nanoprecipitates display deformation-induced nanotwins, offering a supplementary hardening mechanism. These findings underscore the critical influence of mesoscale structure—grain size, IDZ morphology, and precipitate density—on the strength and deformation pathways of WAAM NAB. The insights offer new design strategies for optimizing the performance and reliability of these complex alloys under mechanical loading. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Additive Manufacturing |