About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
New Title: Computational Discovery of Ultra-High Strength BCC Refractory MPEAs |
Author(s) |
Joel M. Berry, Kate Elder, Aurelien Perron |
On-Site Speaker (Planned) |
Joel M. Berry |
Abstract Scope |
The origins of the excellent high temperature mechanical properties of refractory-based BCC HEAs are not well understood. At sufficiently high temperatures, plasticity in these alloys should be mediated by a mix of conservative and nonconservative defect motion, e.g. dislocation glide and climb and vacancy diffusion through the bulk and/or grain boundaries. Further, in HEAs these processes may be significantly modulated by the complex, co-evolving compositional environment. The above effects can span multiple scales and are difficult to simultaneously incorporate into computational models. This has been one factor keeping the microstructural origins of refractory HEA mechanical performance shrouded. We explore a way to address this issue through phenomenologically time-averaged atomistic simulation approaches that incorporate all of the above effects. Simulations span from atomistic to microstructural lengths and cover experimentally relevant, diffusive times. Model development and parameterization issues will be addressed and analysis of preliminary results from simulated deformation experiments presented. |
Proceedings Inclusion? |
Undecided |