Effect of Si Level on the Evolution of Zr‐Bearing Dispersoids and the Related Hot Deformation and Recrystallization Behaviors in Al–Si–Mg 6xxx Alloys
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Bibliographic record
Abstract
The precipitation behavior of Zr‐bearing dispersoids is investigated in Al–Si–Mg 6xxx alloys with different Si levels (0.4, 0.7, and 1.0 wt%) at three homogenization temperatures (450, 500, and 550 °C). The hot deformation behavior is studied using uniaxial compression tests at different Zener–Hollomon parameters. The microstructure evolution during hot deformation and postdeformation annealing is evaluated using the electron backscatter diffraction technique. The results show a significant influence of the Si level and homogenization temperature on the precipitation of two types of Zr‐bearing dispersoids. Si promotes the precipitation of both spherical L1 2 –Al 3 Zr and elongated DO 22 –(Al,Si) 3 (Zr,Ti) dispersoids during low‐temperature homogenization. However, it accelerates the transformation of Zr dispersoids from L1 2 to DO 22 at high homogenization temperature. The flow stress is more influenced by the solid solution level and hot deformation parameters rather than by the dispersoid distribution. The fine dense L1 2 –Al 3 Zr dispersoids provide higher recrystallization resistance during postdeformation annealing compared with the large elongated DO 22 –(Al,Si) 3 (Zr,Ti) dispersoids. Owing to the uniform distribution of dispersoids and limited dispersoid‐free zones, the high Si alloy (1.0%) exhibits best recrystallization resistance among the three alloys studied.
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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 | 0.001 | 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)
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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