Ma, Xian Hui and Nur Azhani, Abd Razak and Asnul Hadi, Ahmad and Nasrul Azuan, Alang (2024) The effect of cooling rate on solidification characteristics and grain structure of Al-9Si cast alloy. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 122 (2). pp. 83-93. ISSN 2289-7879. (Published)
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Abstract
A thermal analysis study is essential before the semisolid metal processing of a particular alloy. The surrounding environment, especially the cooling rate is also an important factor. This study investigated the influence of different cooling rates on thesolidification characteristics and microstructure evolution of the Al-9Si cast alloy. Four cooling mediums were designed, and their cooling rates are 0.16 °C/s, 1.0 °C/s, 1.3 °C/s, and 1.9 °C/s, respectively. The results show that the primary dendrite size ofthe Al-9Si alloy was reduced from 162.61 μm to 86.86 μm as the cooling rate increased from 0.16 °C/s to 1.9 °C/s. Significant grain refinement was observed, however, the external cooling has a negligible impact on solid fraction. The optimal temperature range of the Al-9Si cast alloy for the semisolid metal processing at a solid fraction of 0.5 to 0.7 is between 554 °Cand 563 °C. With these thermal profiles provided, the relationship between the solid fraction and the solidification time could be expressed using the polynomial equation, which is also useful for point prediction in the subsequent semisolid metal processing.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Aluminium alloy; cooling rate; Microstructure formation; Semisolid metal processing; Thermal analysis |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Mechanical and Automotive Engineering Technology |
| Depositing User: | Mrs. Nurul Hamira Abd Razak |
| Date Deposited: | 10 Jun 2025 07:11 |
| Last Modified: | 10 Jun 2025 07:11 |
| URI: | http://umpir.ump.edu.my/id/eprint/44122 |
| Download Statistic: | View Download Statistics |
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