| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Powder and Ceramic Materials Science
|
| Presentation Title |
F-13: Atomistic Modeling of Hot-press Sintering of AlN Nanoceramics |
| Author(s) |
Aoyan Liang, Chang Liu, Paulo Branicio |
| On-Site Speaker (Planned) |
Aoyan Liang |
| Abstract Scope |
We use molecular dynamics atomistic modeling to study the hot-press sintering of AlN nanoceramics. Samples composed of nanoparticles with 8, 12, and 16 nm diameters are employed: namely, samples AlN-8, AlN-12, and AlN-16. Simulations are run for 6 ns under a 1 GPa hydrostatic pressure and 1,900 K temperature. An extra simulation is performed for an 8 nm sized nanoparticle system at a lower pressure of 0.1 GPa (sample AlN-8-0.1). Results show that the AlN-8 sample reaches 99% densification, the highest of all systems. 96.2%, 95.6%, and 93.2% densification is achieved for the samples AlN-8-0.1, AlN-12, AlN-16, respectively. Results reveal a two-stage sintering process: (1) Initial swift densification that is rooted at the high diffusivity of surface atoms. (2) Intense grain growth driven by grain boundary migration. These results offer nanoscale insights on the intriguing hot-press sintering of nanoscale ceramics and shed light on the densification and microstructural evolution processes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Modeling and Simulation, |