About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
Presentation Title |
Nanoporous Amorphous Carbon Nanopillars with Lightweight, Near-theoretical Strength, Large Fracture Strain, and High Damping Capability |
Author(s) |
Zhongyuan Li, Ayush Bhardwaj, Jinlong He, Wenxin Zhang, Thomas T Tran, Julia R Greer, Ying Li, James J Watkins, Seok-Woo Lee |
On-Site Speaker (Planned) |
Zhongyuan Li |
Abstract Scope |
Simultaneous achievement of low weight, high strength, large fracture strain, and high damping capability has been extremely difficult because some of these mechanical properties are inversely related to one another. Here, we investigated the mechanical properties of nanoporous amorphous carbon nanopillars (porosity: 0~59%) fabricated by nanoimprinting and pyrolysis of a mixture of phenol-formaldehyde resin and bottlebrush block copolymers. All nanopillars exhibit ultrahigh strength similar to or even higher than one-tenth Young’s modulus (E), the theoretical breaking strength. Nanoporous structures reduce the mass density (0.66~0.82g/cm3) while the strength of E/10 is still maintained. The reversible portion of the sp2-to-sp3 transition produces not only large elastic strain but also a high loss factor (0.044). The irreversible portion of the sp2-to-sp3 transition produces plastic deformation, leading to the large fracture strain up to 40%. No other known engineering materials exhibit this comparable combination of density, strength, deformability, and damping capability. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Computational Materials Science & Engineering |