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Effect of Cooling Conditions on the Solidification Microstructure and Mechanical Properties of Al–18Si Alloy

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Abstract

In this paper, the effects of cooling conditions on the solidification microstructure and mechanical properties of Al–18Si alloy were studied. Results show that the cooling rate up to about 250 K/s could be obtained with an ultra-low temperature copper tube in the process of melt rapid cooling + mold cooling, which could completely inhibit the precipitation of primary silicon and promote the formation of pseudo-eutectic structure in Al–18Si alloy. While in the existing research, the cooling rate was in the range of 150–200 K/s, which could only refine the primary silicon in the solidification microstructure of hypereutectic Al–Si alloys. With the change of cooling conditions, eutectic silicon changes from needle sheet with large lamellar spacing to fine sheet and then, too dense rod-like structure. The α-Al phase is transformed into a fine dendrite. The impact toughness, tensile strength, and elongation of melt rapid cooling + mold cooling Al–18Si alloy are 29.2 J/cm2, 241 MPa, and 6.4%, respectively. Melt rapid cooling + mold cooling is an effective method to inhibit the precipitation of primary silicon in hypereutectic Al–Si alloys.

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Acknowledgements

This project was supported by National Science Foundation of China (No. 52071032) and Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX22_3034).

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Authors and Affiliations

  1. Key Laboratory of Materials Surface Science and Technology of Jiangsu Province, Changzhou University, Changzhou, 213164, Jiangsu, People’s Republic of China

    Ze Zhu, Han Zhou, Ya Liu, Changjun Wu & Jianhua Wang

  2. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, People’s Republic of China

    Ze Zhu, Han Zhou, Ya Liu, Changjun Wu & Jianhua Wang

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  1. Ze Zhu
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  2. Han Zhou
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  3. Ya Liu
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  4. Changjun Wu
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Correspondence to Jianhua Wang.

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Zhu, Z., Zhou, H., Liu, Y. et al. Effect of Cooling Conditions on the Solidification Microstructure and Mechanical Properties of Al–18Si Alloy. Trans Indian Inst Met 76, 2827–2833 (2023). https://doi.org/10.1007/s12666-023-02980-8

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  • DOI: https://doi.org/10.1007/s12666-023-02980-8

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