Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach
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Bibliographic record
Abstract
Dealloying (selective dissolution) results in the formation of a (nano)porous film which has been proposed to act as a precursor to stress corrosion cracking (SCC) by a cleavage mechanism. The geometry of this film (e.g., ligament size and thickness) influences its ability to act as a precursor. This study investigates the micro-scale mechanical response of a dealloyed layer formed on Alloy 800 when exposed to boiling 50 wt% NaOH solution. Post-exposure in-SEM tensile and micro-cantilever bending tests were conducted on porous films of different geometries, formed after 2, 18 and 24 h of exposure. Results indicate that a porous dealloyed layer is more brittle compared to the base material and SCC can be induced, even with the corrosive environment removed. Increasing the time of exposure coarsened ligaments resulting in increased ductility of the porous film. In contrast, increasing the strain rate resulted in the porous film shifting towards brittle failure.
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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 | 0.002 | 0.002 |
| 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 | 0.001 | 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