Seminar & Colloquium
[세미나: 2월 21일(화), 오후 2시] Dr. Sung-Gyu Kang, Max-Planck-Institut für Eisenforschung GmbH
Title
Additively manufactured 3-dimensional metal microarchitecture: from simple pillars to complex lattices and multi-phase composites
Speaker
Dr. Sung-Gyu Kang, Max-Planck-Institut für Eisenforschung GmbH, Germany
Education
- 2013.3 - 2019.2 Ph.D., Materials Science and Engineering, Seoul National University, Korea
- 2008.3 - 2013.2 BS., Materials Science and Engineering, Seoul National University, Korea
Professional Experience
- 2020.10 - present Post-doc Researcher, Department Structure and Nano-/Micromechanics of Materials, Max-Planck-Institut für Eisenforschung, Germany
- 2019.3 - 2020.9 Post-doc, Materials Science and Engineering, Seoul National University, Korea
- 2013.3 - 2020.9 Researcher, Materials Science and Engineering, Seoul National University, Korea
- 2013.3 - 2018.8 Researcher, High temperature energy materials research center, Korea Institute of Science and Technology, Korea
| Date | Tuesday, February 21st, 2023
| Time | 14:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
Additive manufacturing processes allow structural and functional materials to be fabricated into net shapes. Especially, complex 3-dimensional (3D) architectures for applications requiring mechanical robustness and light weight in aerospace, biomaterials, mechanical band gap engineering, and impact absorption can be achieved. However, at micro- and nanoscale, it is still a challenge to fabricate the 3D architectures. The most common microfabrication technology is ultraviolet (UV) based expose-and-etch based lithographic methods which are only suited for fabricating 2.5D architectures. I will first introduce an additive micromanufacturing process through which true 3D architectures such as springs, helices, or lattices can be achieved. This new process is based on a voxel-by-voxel electrodeposition of microscale metal droplets, making dense microstructure, smooth surface, and circular cross-section achievable. Second, a case study of various 3D copper microarchitectures such as micropillars and microlattices will be presented. Especially, the deformation behavior and mechanical properties were investigated at wide range of strain rate and temperature conditions. Using a piezo-based in-situ micromechanical testing setup, the mechanical properties of the copper microarchitectures were identified as a function of strain rates and temperature. Coupled with the structural and microstructural characterization, we were able to identify the deformation behavior and compare the mechanical performance to previously reported metal architectures. Moreover, the systematic study of the metal architectures fabricated by additive micromanufacturing leads us to the design of new multi-phase composites at microscale. We revealed that the multi-phase composites are reproducible due to the stability of the additive micromanufacturing process and demonstrated their applicability to mechanical and electrochemical applications.
| Host | 최인석 교수 (02-880-1712)