TiAl Intermetallics for Aerospace Applications: Fracture Resistance and Cracking Mechanisms
Bibliographic record
Abstract
Research on TiAl aluminides has been undertaken to further advance the understanding of deformation and fracture mechanisms, vis-a`-vis the heat treatment effects on microstructure, fracture resistance and cracking mechanisms. Two TiAl grades considered comprise of Al-Nb-Mn-Cr-Bal Ti with two different microstructures, namely duplex and lamellar types. The size of colonies in fully lamellar structure also varied widely from 50 micron to 700 microns. Fracture toughness and crack growth resistance are studied under three point bend loading of SEN specimens at room temperature and at higher temperatures (700 °C and 900°C). The fracture resistance behavior for the intermetallics is studied following two methods, namely fracture toughness and crack growth resistance curves (KI vs. Δa). An appreciable improvement (around 50 percent) at 700°C is observed as compared to room temperature data. The crack size analysis is done by elastic compliance method and a normalized compliance curve (NCC) with a power law function for the aluminides is obtained irrespective of temperature. The mechanism of crack initiation as well as crack growth in different microstructures of the alloy is looked into to get an insight of the deformation and cracking process. In lamellar microstructure, colony boundaries appear to be the most preferred path for the crack growth, while multiple cracking mechanisms is observed in duplex structure.
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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".