Effects of heavy ion irradiation on Zr-2.5Nb pressure tube alloy. I. Orientation dependent mechanical response
Bibliographic record
Abstract
In this study, the orientation dependent hardness and creep properties of heavy ion irradiated Zr-2.5Nb pressure tube alloy are investigated by nanoindentation. The indentation tests are conducted along the axial direction (AD) and the transverse direction (TD) relative to the tube. TD samples demonstrate a dependence of the indentation size effect on irradiation damage, which is related to the decrease of the plastic zone size as irradiation damage increases. The hardness of AD and TD samples shows linear dependence on the square root of the irradiation damage density. The transition of the flow pattern from laminar to rotational flow happens in TD samples when the indentation is deeper than 1 μm; rotational flow is expected to be dominant after irradiation. AD samples exhibit laminar flow regardless of indentation depth or irradiation damage. The creep distance is increased for AD while it decreased for TD after irradiation. The creep process in the unirradiated materials and irradiated TD samples is found to be plasticity creep (dislocation glide plus climb). However, for AD samples, the mechanism is changed to power-law creep after 0.6 dpa irradiation. Both the hardness and creep results can be related to the anisotropic deformation mechanisms in the samples.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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) | 0.002 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".