Analysis of Microstructure Evolution and Mechanical Properties of Linear Friction Welded Titanium Alloys
Bibliographic record
Abstract
Two titanium alloys, Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo were linear friction welded in similar and dissimilar combinations to analyze the effects of stress relief annealing on the mechanical and microstructural properties and to compare the results with as-welded state.For the selected set of weld parameters, high-quality welds were obtained with minimal defects.Scanning electron and optical microscopes were used to study the microstructures at various weld zones.Mechanical properties were determined by micro-indentation hardness, tensile, and fatigue testing.The formation of martensite at the weld zone was mainly the reason for the high strength of the weld in the as-welded condition.The local mechanical properties were determined by the digital image correlation (DIC) technique and showed the overall local strain concentration of the welds in the as-welded and stress relieved conditions.The fractographic analysis performed on both the tensile and fatigue samples using an electron microscope showed the characteristic features of ductile fracture.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".