Microstructural and mechanical properties of ZA10 alloy tubes and their weld seams prepared by Conform continuous extrusion
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Bibliographic record
Abstract
Abstract In the present work, Zn–10Al–2Cu–0.05Ti (ZA10) alloy tubes with a diameter of 12.5 mm and wall thickness of 1.2 mm were fabricated by one‐pass and double‐pass Conform continuous extrusion. A stabilizing heat treatment [350 °C, 30 min (furnace cooling) + 120 °C, 12 h (air cooling)] was also applied to some of the double‐pass tubes to improve the quality of their weld seams. The yield strength, ultimate tensile strength, elongation and expansion ratio of the one‐pass continuous extrusion tube were 268.4 MPa, 294.3 MPa, 13.8% and 5.5%, respectively. Double‐pass continuous extrusion improved these values to 278.4 MPa, 317.2 MPa, 15.4% and 11.4%, respectively. Double‐pass tubes also had fewer aggregations of Al‐α precipitates along the welding seam, which improved seam quality and caused cracks to appear in the matrix, away from the weld‐affected zone, during expansion testing. Heat‐treated double‐pass tubes exhibited superior yield strength (283.9 MPa) and ultimate tensile strength (328.5 MPa) but lower elongation (10.2%) and expansion ratios (10.3%). Additionally, the heat‐treated tubes exhibited markedly lower elongation at room temperature due to the remarkable blockage of dislocation motions by fine‐scale lamellar (α + η) eutectoid structures and a lower size effect when stretched.
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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 | 0.000 |
| 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 it