Rakesh, M;
Srivastava, N;
Bhagavath, S;
Karagadde, S;
(2023)
Role of In Situ Formed (Al3Zr + Al3Ti) Particles on Nucleation of Primary Phase in Al-5 wt.% Cu Alloy.
Journal of Materials Engineering and Performance
10.1007/s11665-023-08417-z.
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Abstract
Metal matrix composites are known to exhibit improved mechanical properties due to the reinforcing particles, their shape, distribution, and interaction with the matrix. This study investigates the role of in situ formed Al3Zr, Al3Ti, and a combination of (Al3Zr + Al3Ti) particles on the microstructure, crystallographic orientation relationship, and nucleation behavior of primary Al grains in Al-5 wt.% Cu alloy. The particle dispersion and size were characterized using various microscopy techniques, revealing Al3Ti and Al3Zr particles inside and along the grain boundaries, respectively, even though they exhibit similar crystal structures and lattice matching with aluminum. The (Al3Zr + Al3Ti) particles were observed to have better distribution in the hybrid composite. Using the edge-to-edge model (E2EM), it was found that the hybrid composite exhibited an increased number of close-packed planes and rows, which facilitated easier nucleation. This was confirmed by a cooling curve analysis, which showed that the hybrid composite required the least undercooling to nucleate grains. Further, a simplified heat transfer analysis indicated that Al3Ti caused better nucleation per unit particle, likely due to retaining less heat than Al3Zr. These findings propose a novel mechanism of particle dispersion in the aluminum matrix between the three classes of particles. The study provides valuable insights into the microstructure and crystallographic orientation of in situ composites reinforced by multiple particles.
| Type: | Article |
|---|---|
| Title: | Role of In Situ Formed (Al3Zr + Al3Ti) Particles on Nucleation of Primary Phase in Al-5 wt.% Cu Alloy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s11665-023-08417-z |
| Publisher version: | https://doi.org/10.1007/s11665-023-08417-z |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Metal matrix composites (MMC), microstructures, crystallographic orientation relationships, Thermal Analysis, casting |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10177057 |
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