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Effects of processing variables on melt cleanliness of AZ31B magnesium alloy investigated by quantitative evaluation of Fe and non-metallic inclusions

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Abstract

Impurities such as Fe, Ni and Cu and non-metallic inclusions such as oxides, nitrides, carbides, sulfides and fluorides are harmful to the quality and various properties of magnesium alloy sheets produced by twin-roll casting. In this study, the changes of the content of Fe and non-metallic inclusions in AZ31B magnesium alloys with melt temperature and isothermal holding time were quantitatively evaluated using EPMA and the metallographic method. The Fe content did not increase above the Fe content in the raw material, which implies that the dissolution of Fe from a steel crucible was suppressed effectively. The content of non-metallic inclusions, mainly consisting of oxide, fluoride and Fe-rich intermetallic compounds, did not change remarkably with the melt temperature but it increased with the isothermal holding time due to the continuous oxidation of the magnesium alloy melt on the melt surface.

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Authors and Affiliations

  1. Light Metals Group, Korea Institute of Materials Science, Changwondae-ro 979, Changwon-si, Gyeongnam, 641-831, Korea

    Chang Dong Yim, Na Eun Kang & Bong Sun You

Authors
  1. Chang Dong Yim
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  2. Na Eun Kang
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  3. Bong Sun You
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Correspondence to Chang Dong Yim.

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Yim, C.D., Kang, N.E. & You, B.S. Effects of processing variables on melt cleanliness of AZ31B magnesium alloy investigated by quantitative evaluation of Fe and non-metallic inclusions. Met. Mater. Int. 16, 377–381 (2010). https://doi.org/10.1007/s12540-010-0606-6

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  • DOI: https://doi.org/10.1007/s12540-010-0606-6

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