| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Ultra-uniformity in Nanocrystalline Materials: Implications from Generalized LSW Growth Theory and Validations |
| Author(s) |
Yanhao Dong, Hongbing Yang, Jiangong Li, I-Wei Chen, Ju Li |
| On-Site Speaker (Planned) |
Yanhao Dong |
| Abstract Scope |
Nanocrystalline materials often show superior properties and are thus of great interest. Much has been discussed about ultrafine grain sizes, but little is known about ultra-uniformity, defined as grain size distribution narrower than predicted by the classical theory of Hillert. Here we provide a generalized growth theory unifying the mean-field solutions from Lifshitz, Slyozov, Wagner (LSW) and Hillert. For curvature driven grain growth, we find for growth exponent n >1 a steady-state size distribution that is analytically solvable. Significantly, the distribution narrows with increasing n, and experimental validation of this prediction is found in dense Al2O3 nanoceramics with an extremely uniform microstructure of 34 nm grain size. Reference: Yanhao Dong, I-Wei Chen. "Grain growth with size-dependent or statistically distributed mobility." arXiv preprint arXiv:1708.04092 (2017). |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |