Another Way to Think About the Critical Oxide Volume Fraction for the Internal-to-External Oxidation Transition?
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Bibliographic record
Abstract
Simple concepts derived from percolation theory are used to interpret the transition from internal-to-external selective oxidation in alloys. The analysis is most appropriate for relatively low temperatures, where lattice diffusion of the solute (more reactive element) cannot assist in the formation of an external oxide over any reasonable time scale. It is suggested that over a range of pO2 values, the transition will occur at a roughly constant alloy composition corresponding to a continuum percolation requirement for a nanoscale skeletal oxide formed just below the alloy surface. When this oxide has a sufficiently connected morphology, it provides a short-circuit transport path for the solute. Removal of compressive stress by movement of solvent to the surface is discussed. Predicted values of the critical solute concentration range from 10 at% to 16 at%. Experimental data on Alloy 600 (UNS N06600) oxidation are used to support aspects of the analysis, and to identify unresolved issues.
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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 | 0.000 | 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) | 0.000 | 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