About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Microstructure and Mechanical Deformation of Nanoscale Hydrogel Infusion-based Additively Manufactured Ni |
Author(s) |
Wenxin Zhang, Julia R Greer |
On-Site Speaker (Planned) |
Wenxin Zhang |
Abstract Scope |
Additive manufacturing of nano-sized metals is challenging because it requires high-precision nanofabrication capabilities and custom-synthesized precursors. We developed a nanoscale hydrogel infusion-based additive manufacturing (nanoHIAM) method to create 3D metallic structures with sub-micron dimensions, in which metal ions are infused into two-photon lithography-printed hydrogel matrices and subsequently thermally treated to form metal oxides then further reduced to parent metals. Using this technique, we fabricated nickel (Ni) nanopillars with ~200nm diameters and ~900nm heights. Transmission electron microscopy (TEM) reveals nanoHIAM-Ni to be nanocrystalline (d ~10nm). In-situ uniaxial pillar compressions unveiled yield strengths of ~2-3GPa, higher than the single-crystalline power-law and polycrystalline inverse/classical Hall-Petch predictions. We attribute this unique mechanical performance to the kinetically-driven microstructure, with nanovoids, nanotwins, and high boundary densities influencing the plasticity. Metal-nanoHIAM opens an experimental pathway for combining complex microstructures and geometries and fosters opportunities for nanoscale multifunctionality by introducing 3D architectures beyond 2D patterning. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Nanotechnology |