Understanding thermally grown complex concentrated oxides on AlCrTiVNi5 alloy for high-temperature applications
Bibliographic record
Abstract
Formation energy, lattice distortion, and activation energy of rock-salt and corundum oxides developed from AlCrTiVNi 5 under high-temperature corrosion conditions. • Superior thermodynamic stability of complex concentrated oxides (CCO). • Enhanced hot corrosion resistance of CCO in Na 2 SO 4 /NaCl environments. • Transition from rock-salt to corundum oxides after corrosion. • Favorable dissociation of S 2 and Cl 2 on CCO surfaces. High-temperature (HT) applications demand the development of a slowly growing and adherent thermally grown (TG) oxide scale. The concept of complex concentrated alloys (CCAs) has been extended to oxide systems, resulting in the design of TG complex concentrated oxides (TG-CCOs). A recent advancement involved growing TG-CCOs on a new CCA, AlCrTiVNi 5 , chosen from the valve metal group. In this study, our objective is to delve deeper into TG-CCOs formed on the AlCrTiVNi 5 alloy at 1000 °C. We thoroughly examined the corrosion resistance and structural stability of the CCOs under HT conditions. Results demonstrate that TG-CCOs exhibit superior thermodynamic stability, enhanced corrosion resistance in a mixed Na 2 SO 4 /NaCl environment at 900 °C, and significant changes in crystal structure and composition. The transition of top-layer from rock-salt to corundum phases under corrosion conditions indicates a substantial alteration through density functional theory (DFT) calculations. Moreover, lattice distortion assessments suggest that these structural changes enhance the durability of the oxides. This study underscores the potential of CCOs as protective coatings in power generation industries, offering valuable insights into the design and optimization of high-entropy oxides capable of withstanding severe environmental conditions.
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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 | 0.000 |
| 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 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".