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Hydrogen content and porosity behavior of hypereutectic aluminum-silicon alloy with phosphorus

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Abstract

By making castings that pick up gas from moisture in red sand molds, the porosity generated at different cooling rates was discussed during solidification of hypereutectic Al−25% Si alloy without and with phosphorus additions. The effect of phosphorus addition on hydrogen content in the melt was also studied. It was observed that the phosphorus addition made hydrogen content in alloy melts present a “see-saw” tendency. In addition to primary silicon refinement, the phosphorus promoted gas porosity formed not only in slowly cooled sections, but also in rapidly cooled sections. There was a small difference in density of full dense sample between P-refined and unrefined castings, with a larger density associated with phosphorous addition. The change of the surface tension seemed more reasonable to explain the mechanism of porosity behavior.

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Authors and Affiliations

  1. Key Laboratory of Liquid Structure and Herdeity of Materials, Ministry of Education, Shandong University, 250061, Jinan, China

    Hu Li-na, Bian Xiu-fang & Duan You-feng

Authors
  1. Hu Li-na
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  2. Bian Xiu-fang
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  3. Duan You-feng
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Corresponding author

Correspondence to Hu Li-na.

Additional information

HU Li-na: Born in 1972

Funded by the National Natural Science Foundation of China (No.50071028) and the Natural Science Foundation of Shandong Province (No.Z2001F02)

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Li-na, H., Xiu-fang, B. & You-feng, D. Hydrogen content and porosity behavior of hypereutectic aluminum-silicon alloy with phosphorus. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 19, 65–68 (2004). https://doi.org/10.1007/BF02841372

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  • DOI: https://doi.org/10.1007/BF02841372

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