Distinct phase evolution and deformation instability pattern in a Ce-modified Al-5Mg alloy
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Bibliographic record
Abstract
This study presents a comparative analysis of the effects of Ce addition (1 wt%) on the rate-dependent deformation instability pattern of a Direct Chill (DC)-cast Al-5Mg, thoroughly linked to and explained by the corresponding phase and microstructural evolution. Microscopy results revealed the formation of a considerable volume of Ce-rich eutectic intermetallics (primarily of Al 11 Ce 3 and Al 13 CeMg 6 types) at higher temperatures, effectively suppressing the formation of the β-Al 3 Mg 2 eutectic phase towards the final stages of solidification, a pattern further confirmed via Scheil simulations. Electron Backscatter Diffraction (EBSD) analysis revealed a coarser and less uniform grain size evolution in the Ce-modified alloy, attributed to the potential Ce Ti reaction and, therefore, the neutralization of Ti-rich grain refiners used in the melt. Furthermore, the Ce-added alloy exhibited a stronger texture development in the as-cast state, primarily stemming from the reduced effectiveness of grain refiners and the pinning and stabilizing effect of Ce-rich intermetallics emerging alongside the α-Al primary phase crystallizing during solidification. The analysis of tensile deformation at various strain rates (10 −4 to 10 −2 s −1 ) revealed the development of distinct instability patterns, as characterized by the evolution of Portevin-Le Chatelier (PLC) bands. While similar types of bands were observed at each strain rate in both alloys, the Ce-modified alloy exhibited higher stress-drop magnitudes and lower frequencies of band formation, generally indicating a more localized strain development. Meanwhile, the Ce-added alloy exhibits a significantly higher critical strain, ε c (strain at the onset of flow instability, 8.15 % vs 2.62 %) at the lower strain rate of 10 −4 s −1 , thereby enabling extended uniform deformation and thus enhancing formability potential for sheet metal forming processes where flow stability and surface quality are critical (e.g., in stamping applications for automotive body panels).
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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 | 0.001 |
| 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