Modeling Irradiation Damage in Zr-2.5Nb and Its Effects on Delayed Hydride Cracking Growth Rate
Bibliographic record
Abstract
Zr-2.5Nb is a dual-phase alloy consisting of an hcp (α) phase containing up to 1 wt. % Nb and a bcc (β) phase containing about 20 wt. % Nb. The α phase constitutes the majority of the material volume. For in-service Zr-2.5Nb CANDU pressure tubes, the structures of both the α and β phases evolve as a result of the effects of irradiation and operating temperature: dislocation loop formation in the α phase and decomposition or reconstitution of the β phase. X-ray diffraction data are used to study the irradiation damage (represented by the integral breadth of hcp diffraction peaks and the lattice parameter of the β phase). This evolution of the microstructure must be modeled as a function of operating conditions so that the state of the microstructure of in-service pressure tubes can be predicted. Delayed hydride cracking (DHC) growth rates in Zr-2.5Nb CANDU pressure tube material also depends on the state of the microstructure. In this paper, it is shown that the majority of the DHC growth rate changes can be ascribed to thermal and irradiation effects on the microstructure.
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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 | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".