Stress Corrosion in Mg-Al-Mn Alloy with Residual and Concentrated Stresses
Bibliographic record
Abstract
The effects of residual and concentrated stress on a corrosion mode of a thixomolded Mg-Al-Mn alloy (AM-60) in a NaCl aqueous solution were studied in order to elucidate the corrosion mechanism, the time-dependent characteristics of corrosion products and an actual concentrated stress value in a grain (a-Mg) and a grain boundary (Mg 17 Al 12 ) around an artificial notch. The following results were obtained: (1) Stresses in α-Mg and Mg 17 Al 12 phases existing in a thixomolded Mg alloy plate can be measured separately using the X-ray sin 2 ψ method in the Cr-Ka irradiation area of 1.0 mm in diameter. The recommended 2θ 0 values for stress measurement are 140.0 deg for α-Mg (202) and 133.4 deg for Mg 17 Al 12 (660). (2) The measured residual stresses in a AM-60 plate were about 30 MPa compressive in α-Mg and about 30 MPa tensile in Mg 17 Al 12 phase balancing microscopic region. (3) Even in a lapped Mg-alloy a localized micro-cell exists between α-Mg grain in compressive stress state and grain boundary made of Mg 17 Al 12 in tensile stress state. The proposed model explains well the fact that the grain provides Mg 2+ ions for solution whereas grain boundary acts as a nucleation point of the hydrogen gas bubbles. Corrosion in Mg alloy occurs essentially while it is in contact with any aqueous solution. (4) Corrosion mode of AM-60 in 0.9% NaCI aqueous solution was quite different depending on the sort (sign) of the stresses: a fine and dense amorphous hydro-oxide formed in the region of tensile stress whereas a coarse amorphous oxide formed in that of compressive stress. The former reaction product formed in a short time, but the latter grew gradually.
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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 | 0.000 | 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 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".