The effect of local chemical ordering on dislocation activity in multi-principle element alloys: A three-dimensional discrete dislocation dynamics study
- Award ID(s):
- 1807708
- PAR ID:
- 10396103
- Date Published:
- Journal Name:
- Acta Materialia
- Volume:
- 220
- Issue:
- C
- ISSN:
- 1359-6454
- Page Range / eLocation ID:
- 117307
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
In this research, we employ atomistic simulations to scrutinize the impact of hydrogen (H) on dislocation mobility in iron (Fe). Our study uncovers two critical aspects: Firstly, hydrogen atoms serve to stabilize the edge dislocation core, thereby elevating the shear stress threshold needed for dislocation mobilization. Secondly, hydrogen's influence on dislocation mobility is velocity-dependent; it enhances mobility at low velocities by diminishing lattice resistance but hampers it at high velocities due to increased viscous drag. These nuanced findings illuminate the multifaceted relationship between hydrogen atoms and dislocation mechanisms. They offer valuable insights for the development of materials with enhanced mechanical properties and contribute to strategies for mitigating hydrogen-induced material degradation.more » « less
An official website of the United States government

