Preparation, microstructures, and mechanical properties of directionally solidified Al <sub>2</sub> O <sub>3</sub> /Lu <sub>3</sub> Al <sub>5</sub> O <sub>12</sub> eutectic ceramics
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Bibliographic record
Abstract
Abstract Al 2 O 3 /Lu 3 Al 5 O 12 (LuAG) directionally solidified eutectic (DSE) ceramics with two solidification rates were prepared utilizing optical floating zone (OFZ) technique. The microstructures (eutectic morphology, preferred growth direction and interface orientation) of Al 2 O 3 /LuAG were characterized, and the mechanical properties (Vickers hardness and fracture toughness) were compared with those of Al 2 O 3 /REAG (RE = Y, Er, and Yb). Results show that Al 2 O 3 /LuAG with solidification rate of 30 mm/h has established preferred growth direction in both Al 2 O 3 and LuAG phases with cellular eutectic structures. While Al 2 O 3 /LuAG with solidification rate of 10 mm/h only shows preferred growth direction in Al 2 O 3 phase and presents degenerate irregular eutectic microstructures. Besides, Al 2 O 3 /LuAG exhibits higher hardness compared with Al 2 O 3 /REAG (RE = Y, Er, and Yb). In addition, a special attention is focused on the relations among rare earth ionic radius, eutectic microstructures, and mechanical properties of these DSE ceramics. It is demonstrated that a smaller rare earth ionic radius could lead to larger eutectic interspacing as well as higher Vickers hardness of DSE Al 2 O 3 /REAG, revealing the possibility and feasibility of microstructure control and mechanical properties optimization for DSE Al 2 O 3 /REAG ceramics by tailoring the rare earth elements.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| 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