Microtextural Evolution during Superplastic Deformation in AA8090 Al-Li Alloy
Bibliographic record
Abstract
Evolution of microtexture during superplastic deformation (SPD) of an AA8090 SPF grade sheet was investigated. The SPD was performed by tensile testing at 530°C and at a strain rate of 1x10 - 3 /sec, and the microtexture was analyzed by electron back scatter diffraction technique based Orientation Imaging Microscopy (OIM). Prior to the onset of SPD, there was a variation in distribution of different types of textures across the thickness of the sheet. The center location had a predominantly brass-type texture, whereas the surface location had a copper-type texture. The subsequent microtextural determination in samples deformed to various strain levels showed that, there occurred grain growth, grain shape change and textural weakening. The magnitude of these three microstructural changes continuously increased with the amount of SPD. However, there was no evidence of a development of any new type of texture following the deformation. A sample was also statically heated at a higher temperature of 570°C and for a longer time of one hour to simulate the grain growth to the same level as occurred during SPD. It was observed that without deformation the original grain morphology and textures did not change. Therefore, it was concluded that discontinuous recrystallization did not occur during static annealing, and the texture weakening that occurred during SPD was the result of deformation itself and not due to grain growth.
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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 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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; both teacher heads agree on what is shown here.
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".