Grain boundary sliding in irradiated stressed Fe–Ni bicrystals: a molecular dynamics study
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Bibliographic record
Abstract
Molecular dynamics simulations were used to model grain boundary sliding in stressed Fe-Ni bicrystals exposed to low energy neutron irradiation. We studied how sliding stress thresholds and sliding mechanisms changed with variations in the Ni boundary morphology and boundary geometry. Simulations corresponding to ordered boundary Ni distributions and coincident-site lattice (CSL) geometries relaxed stress through a dislocation-mediated sliding mechanism. Such a mechanism was found to follow Orowan's law, in which the stress relaxation rate is proportional to the dislocation velocity. Alternatively, simulations of disordered Ni distributions and non-CSL boundary geometries were described by a random shuffling process with time-dependent stress relaxation rate. Nevertheless, irrespective of the stress relaxation process followed by the bicrystals, after reaching equilibrium, the amounts of boundary displacement and stress relaxation were always found to be proportionally related. These observations might prove useful to groups working on building continuum (macroscopic) models of deformations in irradiated materials.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it