Cyclic deformation behaviour and saturation bundle structure in Ti–5 at.% Al single crystals deforming by single prism slip
Bibliographic record
Abstract
Cyclic deformation behaviour and dislocation structure of Ti–5 at.% Al single crystals oriented for single prism slip have been studied. Ti–5 at.% Al tested under total strain control (Δεt/2) displays an initial slight cyclic hardening followed by a striking softening period, and then a saturation stage is reached in the range 0.2–1.0%, except at a very low strain amplitude (0.2%) at which the initial hardening is replaced by an immediate cyclic softening. The saturation stages occupy most of the lifetime. The cyclic stress–strain curve (CSSC) contains a clear stress plateau region within the tested plastic shear strain amplitudes (0.039–1.68%). The plateau shear stress was about 85 MPa. () single prism slip was observed on the surface of the fatigued specimen using an optical microscope, and became denser as the cyclic strain amplitude or cyclic number increased. The typical dislocation structure in the primary slip plane is the saturation bundle structure (SBS), which consists mainly of dense screw dislocations parallel to the direction and dislocation bundles nearly perpendicular to the direction, that is closely parallel to the [0001] direction. Some dislocation slabs were observed in the (0001) foils. The dislocation structure in Ti–5 at.% Al single crystals evolves from the elongated screw dislocation lines along [] during the stage of the first cyclic hardening to the parallel screw dislocation lines together with the dislocation bundles nearly along [0001] in the stage of cyclic softening, and a well-developed SBS is finally formed in the stage of saturation. The relationship between the cyclic plateau behaviour and the saturated bundle structure of Ti–5 at.% Al single crystals is discussed.
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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 | 0.000 | 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 | 0.001 |
| 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".