Strain rate-induced crystallographic texture development in tensile deformation of a rapidly solidified thin-strip cast AA5182 Al-Mg alloy
Bibliographic record
Abstract
This study investigates the evolution of ultimate crystallographic texture in AA5182 Al-Mg alloy under uniaxial tensile deformation at quasi-static strain rates (10 −3 and 10 −1 s −1 ), focusing on two casting routes of thin-strip (TS) and direct-chill (DC) casting. The TS sample, solidified at ∼10 3 K/s, exhibited an initial average grain size of 49.7 μm, significantly finer than the 114.5 μm observed in the DC counterpart solidified at a cooling rate of ∼10 1 –10 2 K/s. The fraction of intermetallic particles in the TS sample (∼2.74 %) was markedly lower than in the DC sample (∼6.07 %), contributing to enhanced solute supersaturation and reduced strain localization, which is linked to a lower frequency of low-angle misorientations within the matrix. Texture analysis revealed that TS samples experienced an approximately 28 % increase in texture index (from 1.32 to 1.69) with increasing strain rate, compared to a 15 % rise in DC samples (from 1.75 to 2.01), indicating more pronounced strain-induced texture development in the TS sample. Taylor factor (M) analysis showed a greater fraction of favorably oriented grains (M ≤ 2.5) in as-cast TS samples, increasing from 11.5 % to 14.0 % after deformation, compared to an increase from 7.5 % to 14.6 % in the DC samples. However, the DC sample exhibited greater strain localization and a higher kernel average misorientation (KAM, 0.83 vs. 0.67), consistent with its higher density of intergranular/interdendritic intermetallic particles and coarser structure. It was demonstrated that in the TS sample, strain accommodation primarily occurred through grain rotation and dislocation annihilation, facilitated by lower particle density and higher solute supersaturation. By contrast, the DC sample accommodated strain mainly through dislocation pile-ups and boundary-mediated mechanisms, resulting in more constrained deformation behavior. The unique microstructure in the TS sample enabled a broader range of grain rotation trajectories, resulting in a higher number of distinct texture evolution pathways. These findings underscore the critical role of casting routes in governing texture development and highlight the superior potential of the TS sample for enhanced ductility and formability under dynamic loading conditions.
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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 | 0.001 | 0.001 |
| 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".