| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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| Presentation Title |
Kinetically-Driven Microstructure and Mechanical Properties of 3D Micro-architected Metal Alloys formed via Hydrogel Infusion Additive Manufacturing (HIAM) |
| Author(s) |
Thomas T. Tran, Rebecca Gallivan, Julia R. Greer |
| On-Site Speaker (Planned) |
Thomas T. Tran |
| Abstract Scope |
Hydrogel infusion-based additive manufacturing (HIAM) is unique in its absence of melt solidification. By nucleating parent oxides and subsequently reducing them, HIAM provides a kinetically-driven pathway for forming boundaries in polycrystalline metal microarchitectures. Using EBSD and TEM analysis, we characterize the microstructural features within HIAM-produced Cu, Ni, and Cu-Ni alloys. These metals and alloys exhibit anomalous nanoindentation hardnesses, exceeding predictions by the Hall-Petch relation by over 30%, which we postulate as due to the network of high-angle, annealing twin, and higher-order coincident site lattice boundaries. We explore these formed boundaries by conducting site-specific compression experiments on nano- and micropillars carved from individual grains -- as well as spanning specific boundaries --, isolating each contribution to plasticity in HIAM-produced metals. We present a phenomenological framework accounting for the contribution of special boundaries to global mechanical properties, which helps inform HIAM as a novel means for architecting alloys with non-equilibrium microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |