| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Study on Role of Irradiation Induced Vacancies and Voids on Strain-induced Martensitic Transformations by Molecular Dynamics |
| Author(s) |
Chao Yang, Yash Pachaury, Anter El-Azab, Janelle Wharry |
| On-Site Speaker (Planned) |
Chao Yang |
| Abstract Scope |
Strain-induced martensitic transformations can improve the strength and ductility of face centered cubic metals and alloys. Defects such as vacancies, dislocation loops, and voids – often introduced by irradiation – activate martensitic transformations over a wider range of conditions than the pristine material. However, the mechanisms underlying irradiation-enabled martensite transformations remain unclear. In this work, molecular dynamics simulations study the effect of vacancies and voids on strain-induced transformations. Single vacancies have no resolvable effect on the transformation because they reduce the stacking fault energy by a relatively insignificant margin and do so only if the vacancy is located on the stacking fault plane. Voids, however, activate the martensite transformation through shear strain accumulation around the void due to dislocation pileup. The larger the void, the more pronounced this effect. Mechanisms identified here are consequential to the deformation behavior of porous, nanoporous, irradiated, and hydrogen- or helium-charged steels and FCC alloys. |
| Proceedings Inclusion? |
Undecided |