Abstract
The Al–7Si–0.3 Mg (A356) alloys with various contents of the rare earth element Er, Zr were prepared by the conventional casting technique. The effect of Er, Zr composite modifications on the microstructure and mechanical properties of A356 alloys was investigated using the optical microscopy (OM), scanning electronic microscopy (SEM), energy spectrum analysis and mechanical testing. The results show that addition of 0.3 wt% Er and Zr had an excellent refining effect on α-Al grains and a modification effect on Si containing phase in the as-cast state. The size of α-Al dendrite reduced, the acicular eutectic Si became short rod-shaped or granular. When Er and Zr content was 0.3 wt%, the tensile strength and hardness of the alloys reached up to maximum values.
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Acknowledgements
The authors would acknowledge support from National Natural Science Foundation of China (51671005), Beijing Natural Science Foundation (2162006), the National Key Research and Development Program of China (2016YFB0300804 and 2016YFB0300801), National Natural Science Fund for Innovative Research Groups (51621003) and Program on Jiangsu Key Laboratory for Clad Materials (BM2014006).
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Ji, L., Wang, W., Huang, H., Wen, S., Gao, K., Wu, X. (2018). Effect of Erbium–Zirconium Composite Modifications on the Microstructure and Mechanical Properties of A356 Aluminum Alloy. In: Han, Y. (eds) High Performance Structural Materials. CMC 2017. Springer, Singapore. https://doi.org/10.1007/978-981-13-0104-9_11
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DOI: https://doi.org/10.1007/978-981-13-0104-9_11
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