Two-pulse laser-induced spall failure of (111) twist grain boundaries in Ni bicrystals
Why this work is in the frame
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Bibliographic record
Abstract
Spall failure, a complex failure mechanism driven by tensile stress wave interactions, has been extensively studied in single-crystal FCC metals, revealing a precursor stage involving dislocation emission along closed-packed directions. Here we investigate the laser-induced spall failure of Ni bicrystals under a two-pulse laser configuration, exploring various misorientation angles through two-temperature molecular dynamics (MD) simulations including electronic effects to simulate light–matter interaction. Our findings demonstrate that light–matter interactions can induce spall failure at the sample center, similar to conventional plate-impact methods, when two laser-pulses are applied to the front and back surfaces of the sample. The study reveals the significant influence of misorientation angles on dislocation activity and spall behavior, where grain boundaries (GBs) play pivotal roles, either promoting or impeding dislocation interactions. Furthermore, our work highlights the potential for enhancing spall resistance by tailoring materials through misorientation angle variation.
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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 | 0.001 |
| 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) | 0.000 | 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