In-situ quantitative investigation of the growth inhibition effect of TiCN nanoparticles on primary α-Al in Al–Cu–Si alloys
In-situ synchrotron X-radiography studied the impact of TiCN nanoparticles (TiCNnp) on α-Al dendrite morphology and growth in Al–13Cu–7Si alloys. Comparative experiments were conducted without nanoparticles and with the addition of Al–5Ti–1B. Despite Al–5Ti–1B had almost no refining effect, 0.5% TiC...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424026395 |
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| Summary: | In-situ synchrotron X-radiography studied the impact of TiCN nanoparticles (TiCNnp) on α-Al dendrite morphology and growth in Al–13Cu–7Si alloys. Comparative experiments were conducted without nanoparticles and with the addition of Al–5Ti–1B. Despite Al–5Ti–1B had almost no refining effect, 0.5% TiCNnp notably reduced α-Al grain size of Al–Cu–Si alloys, especially at higher cooling rates. When cooled at a rate of 0.2K/s, the dendrite tip radius of α-Al with the addition of TiCNnp (18.2 μm) was approximately twice as large as that without nanoparticles (9.8 μm). Concurrently, the primary dendrite growth rate of α-Al without nanoparticles exceeded that with TiCNnp by approximately 15 times. This discrepancy can be attributed to the coarser dendrite tip of α-Al induced by TiCNnp, which led to a greater solute accumulation in front of the tip. Furthermore, the area growth rate of both grain and solute suppressed nucleation zone (SSNZ) with addition of TiCNnp was only one-tenth of that observed with Al–5Ti–1B. Consequently, the incorporation of TiCNnp resulted in a significantly smaller nucleation-free zone, facilitating the activation of a greater number of nucleation sites within the melt. This study sheds light on the growth inhibition mechanism of TiCNnp in Al–Si alloys. |
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| ISSN: | 2238-7854 |