Abstract
In this work, a 6061-SiC composite was prepared using the compound casting method and then processed using a vacuum-assisted high-pressure die-casting technology under fast shot speeds of 1, 2 and 3 m/s, respectively. The effect of fast shot speed and wall thickness on the skin layer, porosities and mechanical properties were studied. The results showed that, with the increase of the fast shot speed, the thickness of the skin layer was decreased significantly. The porosities of the samples were decreased first and then increased with the increase of wall thickness. The pore number in the 4-mm sample was the smallest, while the pore number in the 8-mm sample was the largest, with many large-sized strip shrinkage pores. Under a fast shot speed of 1 m/s, the large-sized pores and the skin layer (~ 0.5 mm) led to the brittle fracture and low tensile properties of the sample. When the fast shot speed was increased to 3 m/s, the defects of the microstructures mentioned above were improved, and the sample’s tensile properties were further improved.
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Acknowledgments
The research is supported by the Natural Science Foundation of Jiangxi Province (Grant No. 20192BAB206003); the Open Funds of Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province (Grant No. EJ201903061); the Open Funds of National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, Key Laboratory of High-efficiency Near-net-shape Forming Technology and Equipments for Metallic Materials, Ministry of Education (Grant No. 2018001); the PhD Research Foundation Project of Nanchang Hangkong University (Grant No. EA201803210); the National Natural Science Foundation of China (Grant No. AA202103036).
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Manuscript submitted December 14, 2020, accepted April 18, 2021.
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Hu, Q., Guo, W., Xiao, P. et al. Effects of Fast Shot Speed and Wall Thickness on the Microstructures and Mechanical Properties of the High Pressure Die-casting 6061-SiC Composites. Metall Mater Trans B 52, 2283–2293 (2021). https://doi.org/10.1007/s11663-021-02197-4
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DOI: https://doi.org/10.1007/s11663-021-02197-4