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Title
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Segregation behavior and its regulating process in as-cast magnesium alloy containing heavy rare earth
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Type
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JournalPaper
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Keywords
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Mg-RE alloy Segregation Composition homogeneity Melting process Mechanical stirring Rare earths
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Abstract
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Specific gravity segregation that occurs during the smelting process always leads to the low composition homogeneity and poor performance stability of the magnesium-rare earth (Mg-RE) alloys. In this study, the segregation behavior of Mg–Gd alloy was investigated by sampling from different locations in the ingot fabricated in a resistance furnace without a pouring process. The combined application of induction-heating and mechanical stirring with various speeds (0–130 r/min) was applied to promote the distribution homogeneity of Gd atoms. In the resistance-heating fabricated ingot, Gd content at the bottom section reaches 407% of that at the top. The coarse dendrites surrounded by the network-like eutectic structures are responsible for the brittle fracture with a poor elongation of 3.7%. By the combined employment of the induction heating and mechanical stirring with the speed of 87 r/min at 740 °C for 40 s, the variation of the Gd content within the whole ingot can be reduced to be the minimum of 0.23 wt%. Corresponding formation and regulating models of segregation were also proposed. However, the cooling rate of the melt is reduced by the continuous increase of the stirring speed to 130 r/min, which results in the grain coarsening and lower homogeneity of the ingot.
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Researchers
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Shokouh Attarilar (Not In First Six Researchers), Xinyue Deng (Fifth Researcher), Mahmoud Ebrahimi (Fourth Researcher), Fanjin Yao (Third Researcher), Guoqiang You (Second Researcher), Xin Tong (First Researcher)
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