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Synchronously Improving the Thermal Conductivity and Mechanical Properties of Al–Si–Fe–Mg–Cu–Zn Alloy Die Castings Through Ultrasonic-Assisted Rheoforming

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

An ultrasonic vibration-assisted air-cooled stirring rod process (ACSR + UV) was used to efficiently prepare a large-volume semisolid slurry with a mass of more than 40 kg. A low-cost Al–Si–Fe–Mg–Cu–Zn die-casted alloy with high thermal conductivity, high plasticity and medium strength was developed. The alloy was used to manufacture large, thin-walled parts for 5G base stations by using the ACSR + UV rheological die-casting (ACSR + UV R-DC) process. Investigations were performed on the microstructure, porosity, mechanical properties, fracture behaviour and thermal conductivity of the ACSR + UV R-DC alloy, which was then compared to traditionally die-casted (T-DC) and ACSR R-DC alloys. The mechanisms for the microstructural refinement and enhancement of the mechanical and thermal conductivity performances of the ACSR + UV R-DC alloy were also analysed. The results showed that the ACSR + UV process increased the nucleation rate of the melt due to the increase in the nucleation area and the generation of cavitation bubbles. A radial- and an axial-forced convection was also generated inside the melt under the combined effects of acoustic flow and mechanical stirring, thereby homogenising the melt composition field and the temperature field. Therefore, the ACSR + UV R-DC process not only refined the primary α-Al (α1-Al), the eutectic silicon and the secondary α-Al (α2-Al), but also greatly improved the morphology and the distribution of the β-Al5FeSi phase. The mechanical properties of the ACSR + UV R-DC alloy were higher than those of the T-DC and the ACSR R-DC alloys. Compared to the T-DC alloy, the ultimate tensile strength, elongation and yield strength of the ACSR + UV R-DC alloy were increased by 34%, 122% and 19%, respectively. This was because the ACSR + UV R-DC technique gave the alloy the characteristics of high density, fine spherical α1-Al grain and a fine and uniform β-phase, which improved the fracture behaviour of the alloy. The thermal conductivity of the ACSR + UV R-DC alloy was 184 W/(m K), which was 10.2% and 3.4% higher than that of T-DC and ACSR R-DC alloys, respectively. This was because the refined eutectic silicon and β phases in the ACSR + UV R-DC alloy facilitated an easier electron flow through the eutectic region, and the decrease in porosity increased the effective area of heat conduction.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52005034 and 52027805), the Fundamental Research Funds for the Central Universities (No. FRF-TP-18-043A1), the Zhuhai Industry-University-Research Cooperation Project (No. ZH22017001200176PWC) and the China Postdoctoral Science Foundation Funded Project (No. 2019M650486).

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Authors and Affiliations

  1. Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Mingfan Qi, Yonglin Kang, Jingyuan Li & Yuzhao Xu

  2. Zhuhai Runxingtai Electric Co., Ltd, Zhuhai, 591000, China

    Jicheng Wang & Gunan Li

  3. Center International Group Co., Ltd, Beijing, 100176, China

    Aisen Liu

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  1. Mingfan Qi
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  2. Yonglin Kang
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  3. Jingyuan Li
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  7. Aisen Liu
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Correspondence to Jingyuan Li.

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Qi, M., Kang, Y., Li, J. et al. Synchronously Improving the Thermal Conductivity and Mechanical Properties of Al–Si–Fe–Mg–Cu–Zn Alloy Die Castings Through Ultrasonic-Assisted Rheoforming. Acta Metall. Sin. (Engl. Lett.) 34, 1331–1344 (2021). https://doi.org/10.1007/s40195-021-01231-3

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  • DOI: https://doi.org/10.1007/s40195-021-01231-3

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