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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| Authors: | Chang Dong Yim Na Eun Kang Bong Sun You |
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| Affiliation: | (1) Department of Mechanical Engineering, University of Wisconsin, Madison, WI 53706, USA;(2) Department of Materials Science and Engineering, University of Wisconsin, Madison, WI 53706, USA;(3) Department of Engineering Physics, University of Wisconsin, Madison, WI 53706, USA |
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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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