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
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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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) | 0.000 | 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 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".