Analysis of accelerated irradiation growth in Zr-2.5% Nb pressure tubes
Bibliographic record
Abstract
Recent experimental evidence of creep and growth of Zr—2.5% Nb CANDU pressure tubes under irradiation shows an increase in the growth rate with accumulated fluence. Such a feature has been linked to a climb of c-type dislocation loops produced by a bias in the migration of vacancies and interstitials. In this work we link several material scales in order to relate the macroscopic response of the tubes with the physical mechanisms involving the point defects on the microscopic scale. Our model includes the influence of internal stresses on defect diffusivity, the dependence of creep and growth moduli of the single crystal on the evolving microstructure, and the intergranular stresses responsible for the bias. All these elements are combined in a self-consistent polycrystal model for creep and growth. We show that this approach can explain the observed growth acceleration and we derive physically meaningful values of some of the microstructural parameters.
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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) | 0.001 | 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 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".