Effect of C and Al Elements on High Specific Resistance and High Rigidity of Ultra-High Strength TiC<sub>(1−<i>X</i>)</sub>/Ti Metal Matrix Composites Fabricated by Blended Elemental Reactive Sintering
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Bibliographic record
Abstract
The effects of C and Al concentrations on the specific resistance and rigidity of newly developed ultra-high strength titanium-based metal matrix composites (Ti-MMCs), fabricated using blended elemental reactive sintering (BERS), were investigated. Both TiC(1−X)/Ti–6Al–4V and Ti–8.6Al–5.7V composites were compared with TiB/, SiC/ and AlN/Ti-MMCs. TiC was found to react with Ti powder and to transform to TiC(0.50–0.62) during sintering. The resulting TiC(0.50–0.62)/Ti–8.6Al–5.7V exhibited a specific resistance of 2.33 µΩm, a Young’s modulus of 135 GPa and a tensile strength of 1.25 GPa, with a substantial elongation of approximately 2.5%. In contrast, TiB/Ti–6Al–4V showed excellent mechanical properties but an extremely low electrical resistance because the conducting TiB particles had a specific resistance of only 0.07 µΩm. Both SiC and AlN also reacted with Ti powder during sintering to form a brittle phase at the interfaces between the particles and the Ti matrix. As a result, Ti–6Al–4V MMCs suitable for use as structural materials could not be fabricated using BERS with SiC or AlN. The high specific resistance of the TiC(0.50–0.62)/Ti–8.6Al–5.7V is partly attributed to the C deficiency of the TiC(0.50–0.62) particles, which results in a specific resistance of approximately 1.7 µΩm. This value is approximately three times higher than the value of 0.52 µΩm for stoichiometric TiC particles. The solubility of excess C and Al in the Ti matrix also increases the specific resistance of the material.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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