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Effect of Ce Addition on the Thermal Conductivity and Mechanical Properties of Al-7Si-0.6Fe-0.5Zn Cast Alloy Treated by B/La/Sr Modification

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Abstract

In order to further improve the thermal conductivity and mechanical properties simultaneously of the base alloy (Al-7Si-0.6Fe-0.5Zn alloy) treated by B/La/Sr modification, the La content was further optimized in the B/La/Sr-modified process, and the Ce element was added into the melt treated by B/La/Sr modification to get higher improvement. For the B/La/Sr-modified alloys, when the content of La decreases from 0.15 to 0.05%, the thermal conductivity (λ) and integrated mechanical properties index (Q) increase 3.1W/(m·K) and 21.1MPa, respectively. In the B/La/Ce/Sr-modified alloys, the λ and Q increase simultaneously with the increase of the Ce content, reaching the maximum of 179.2W/(m·K) and 380.2MPa, respectively, when the Ce content reaches 0.5%, and then decrease simultaneously with the further increase of the Ce content. When the Ce content is not more than 0.5%, the morphology change of the Fe-rich phases is the main reason for the simultaneous improvement of the thermal conductivity and the mechanical properties of the B/La/Ce/Sr-modified alloys. When the Ce content is more than 0.5%, the precipitation of the needle flake-like Ce-rich phases and coarse flake-like Si phases is the main reason for the simultaneous deterioration of the mechanical properties and thermal conductivity.

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Acknowledgements

The authors are very grateful to the Key scientific research platforms and projects of ordinary universities in Guangdong Province in 2021 (2021KCXTD076).

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Authors and Affiliations

  1. School of Automotive Engineering, Guangdong Polytechnic of Industry and Commerce, Avenue North 963, Tianhe District, Guangzhou, 510510, Guangdong, People’s Republic of China

    Gan Junqi, Pan Mengyao, Huang Meihong & Wang Feng

  2. School of Mechanical and Electrical Engineering, Guangdong Polytechnic of Industry and Commerce, Guangzhou, 510510, Guangdong, People’s Republic of China

    Chen Qiming & Song Xianwen

  3. Guangdong Zhaoqing Institute of Quality Inspection and Metrology, Zhaoqing, 526070, Guangdong, People’s Republic of China

    Wen Hao

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  1. Gan Junqi
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Junqi, G., Mengyao, P., Qiming, C. et al. Effect of Ce Addition on the Thermal Conductivity and Mechanical Properties of Al-7Si-0.6Fe-0.5Zn Cast Alloy Treated by B/La/Sr Modification. Inter Metalcast 17, 874–887 (2023). https://doi.org/10.1007/s40962-022-00807-8

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