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Effects of processing parameters on the refinement of primary Si in A390 alloys with a new Al–Si–P master alloy

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Abstract

In this study, a new Al–17Si–2.5P master alloy has been successfully prepared to refine primary Si in hypereutectic A390 alloys. By means of electron probe microanalyzer (EPMA), a large number of AlP particles can be found in the Al–17Si–2.5P master alloy. An orthogonal L9(33) test was designed to investigate the integrated effects of refining factors including phosphorus addition level, melting temperature and holding time, and subsequently to optimize the processing parameters. It is found that under the optimized conditions, i.e., phosphorus addition of 375 ppm, melting temperature of 800 °C, and holding time of 30 min, the average sizes of primary Si can be most remarkably decreased from 116 μm to 14 μm with sphere-like morphology. Meanwhile, the Brinell hardness and tensile strength can be significantly increased by 14.1 and 27.8%, respectively. In addition, thermal analysis is also performed with differential scanning calorimeter (DSC) to analyze the solidification process of Al–18Si alloys.

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Acknowledgements

This work was supported by a grant from National Science Fund for Distinguished Young Scholars of China (No. 50625101), Key Project of Science and Technology Research of Ministry of Education of China (No. 106103), and “Taishan Scholar” Construction Project for financial support of Shandong Province in China.

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Authors and Affiliations

  1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, 73 Jingshi Road, Jinan, 250061, People’s Republic of China

    Min Zuo & Xiangfa Liu

  2. Shandong Binzhou Bohai Piston Co., Ltd, Binzhou, Shandong, 256602, People’s Republic of China

    Xiangfa Liu

  3. Shandong Shanda Al & Mg Melt Tech. Co., Ltd, Jinan, Shandong, 250061, People’s Republic of China

    Qianqian Sun

Authors
  1. Min Zuo
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  2. Xiangfa Liu
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  3. Qianqian Sun
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Correspondence to Xiangfa Liu.

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Zuo, M., Liu, X. & Sun, Q. Effects of processing parameters on the refinement of primary Si in A390 alloys with a new Al–Si–P master alloy. J Mater Sci 44, 1952–1958 (2009). https://doi.org/10.1007/s10853-009-3287-0

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  • DOI: https://doi.org/10.1007/s10853-009-3287-0

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