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- Title
Finite-temperature screw dislocation core structures and dynamics in α-titanium.
- Authors
Liu, Anwen; Wen, Tongqi; Han, Jian; Srolovitz, David J.
- Abstract
A multiscale approach based on molecular dynamics (MD) and kinetic Monte Carlo (kMC) methods is developed to simulate the dynamics of an 〈a〉 screw dislocation in α-Ti. The free energy barriers for the core dissociation transitions and Peierls barriers for dislocation glide as a function of temperature are extracted from the MD simulations (based on machine learning interatomic potentials and optimization); these form the input to kMC simulations. Dislocation random walk trajectories from kMC agree well with those predicted by MD. On some planes, dislocations move via a locking-unlocking mechanism. Surprisingly, some dislocations glide in directions that are not parallel with the core dissociation direction. The MD/kMC multiscale method proposed is applicable to dislocation motion in simple and complex materials (not only screw dislocations in Ti) as a function of temperature and stress state.
- Subjects
SCREW dislocations; DISLOCATION structure; ACTIVATION energy; RANDOM walks; MOLECULAR dynamics
- Publication
NPJ Computational Materials, 2023, Vol 9, Issue 1, p1
- ISSN
2057-3960
- Publication type
Article
- DOI
10.1038/s41524-023-01181-7