| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
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| Presentation Title |
Enhancing Mechanical Properties of Alloys with Non-equilibrium Microstructures Formed During Hydrogel Infusion-based Additive Manufacturing (HIAM) |
| Author(s) |
Thomas T. Tran, Julia R Greer |
| On-Site Speaker (Planned) |
Thomas T. Tran |
| Abstract Scope |
We utilize the hydrogel infusion-based additive manufacturing (HIAM) process to form 3D-microarchitected alloy lattices with non-equilibrium microstructures. Direct reduction of HIAMed scaffolds of nanograined metal oxide components in hydrogen gas induces concurrent phase transformations and sintering that convert them into metallic parts with complex nanoscale featuring. Using CuxNi1-x as a model material, we reveal with scanning and transmission electron microscopy hierarchical arrangements of internal voids (d<50nm) and residual oxide inclusions (sub-nm), as well as coarser oxide grains (d~500nm) with coherent metallic nuclei (d<15nm), all contained within a Cu15Ni85 solid solution. Rapid growth of matrix grains also generates high annealing twin densities of >105mm-1, which is commensurate with thermomechanically processed bulk metals in literature. To demonstrate HIAM’s ability to develop novel metallic material systems, we discuss individual contributions of observed microstructural features to their enhanced mechanical performance, employing site-specific and in-situ uniaxial compression of FIB-micromachined micro- and nanopillars. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Characterization, Phase Transformations |