Microstructure of Directionally Solidified Ti-52Al-2W-0.5Si Intermetallic
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Bibliographic record
Abstract
The phase transformations controlling the microstructural evolution during directional solidification (DS) using the Bridgeman process and subsequent cooling are described for a Ti-52Al-2W-0.5Si intermetallic. The DS structure consists mainly of columnar dendrites with various shapes. α-Ti with a dendritic morphology is the primary solidified phase, followed by an incomplete peritectic reaction liquid (L)+α → γ-TiAl. The remaining liquid solidified as y and silicides. During cooling after solidification a dendrites transform into ordered α 2 and y with various morphologies, including near fully lamellar, script α 2 in a y matrix and blocky α 2 in a y matrix. Very fine tungsten-rich precipitates are also observed. The DS alloy is quite brittle. The microstructural evolution and the reason leading to the brittleness of the alloy are discussed.
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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) | 0.001 | 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 it