FIB/SEM Study of Pitting and Intergranular Corrosion in an Al-Cu Alloy
Bibliographic record
Abstract
Scanning electron microscopy (SEM) with energy dispersive x-ray spectroscopy (EDX) was used to study the formation of stable pits on an aluminum-copper casting alloy in artificial seawater solution at 10°C. The polished specimens were immersed for various times and the development of corrosion around intermetallic particles was monitored. Focused ion beam (FIB)/SEM was used to determine the subsurface microstructure at selected local attack sites within the corroded area. The earliest stages of attack started with pit initiation at the surface of intermetallic particles resulting in dealloying. Cu redistribution occurred during corrosion over the entire surface and its concentration differed from one site to another. FIB imaging revealed that localized corrosion was propagated where continuous particles were buried beneath the surface. Dealloying of the particle and matrix/particle interfacial attack produced a sponge-like remnant and cracks at the interface, respectively. Propagating away from the initiation sites, corrosion developed preferentially along the grain boundary network beneath the alloy surface.
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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 | 0.001 | 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 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".