Hydrogen Induced Cracking of Titanium Alloys in Environments Anticipated in Yucca Mountain Nuclear Waste Repository
Bibliographic record
Abstract
Abstract This paper presents a review hydrogen-induced cracking (HIC) of Ti Grade 7 and other relevant titanium alloys under nuclear waste repository environmental conditions, with a primary emphasis on the corrosion processes possible in aqueous environments at Yucca Mountain. The current understanding of hydrogen absorption and the role of passive film on titanium alloys is presented. The key corrosion processes that could occur are addressed individually. Finally, the models developed to assess the hydrogen concentration in the drip shield due to passive general corrosion and galvanic coupling to less noble metals under repository conditions is described. To facilitate the discussion, Ti Grades 2, 5, 7, 9, 11, 12, 16, 17, 18, and 24 are included in this review. It can be concluded that under repository conditions, HIC of titanium alloys will not occur because there will not be sufficient hydrogen in the metal even after 10,000 years of emplacement. Based on the many assumptions adopted this assessment can be considered very conservative.
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How this classification was reachedexpand
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 | 0.000 | 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 teacher head, 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".