Phase-field dislocation modeling of cross-slip
Journal Article
·
· Journal of Materials Science
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Santa Barbara, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Santa Barbara, CA (United States)
The phase-field dislocation dynamics (PFDD) model is extended to simulate cross-slip in body-centered cubic materials. The model makes use of a non-orthogonal, body-centered cubic numerical grid such that all calculable points lie on dislocation glide planes. We demonstrate that the advanced PFDD model predicts a low-energy, non-planar core for screw dislocations and a planar core for edge dislocations. These core differences result in screw-edge character dependence in the critical stress to initiate glide and dislocation drag coefficients. Finally, we show that this model can be used to study the propensity of screw dislocations to cross-slip around or transmit through a coherent, crystallographic obstacle, depending on obstacle strength.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- US Office of Naval Research (ONR); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- 89233218CNA000001; NA0003960
- OSTI ID:
- 1840885
- Report Number(s):
- LA-UR--21-28272
- Journal Information:
- Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 23 Vol. 57; ISSN 0022-2461
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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