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Macrosegregation Induced by Floating Grains in Direct-Chill Casting of Aluminum Alloys

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The macrosegregation mechanism induced by floating grains in direct-chill casting of aluminum alloys was elucidated. Floating grains consist of interior solute-depleted coarse- and peripheral fine dendrites. During direct-chill casting, some grains freely travel in slurry zone, where the low-temperature gradient results in the slow but unconstrained dendrites growth. The resulting coarse and solute-lean dendrites are then transported to casting center and entrapped by mushy zone, where the periphery fine dendrites subsequently grow.

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This work was supported by the National Natural Science Foundation of China (No. U1864209, 51771066); the China Postdoctoral Science Foundation (No. 2018M642308); and the Jiangsu Planned Projects for Postdoctoral Research Funds (No. 2018K068C).

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Authors and Affiliations

  1. High-Performance Metal Structural Materials Research Institute, School of Iron and Steel, Soochow University, Suzhou, 215021, China

    Qipeng Dong, Jun Xia, Xiaming Chen, Xinzhong Li & Hiromi Nagaumi

  2. China Hongqiao Group Limited, Binzhou, 256200, China

    Bo Zhang

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  1. Qipeng Dong
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  2. Jun Xia
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  3. Xiaming Chen
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  4. Xinzhong Li
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Correspondence to Hiromi Nagaumi.

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Manuscript submitted October 6, 2020; accepted March 3, 2021.

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Dong, Q., Xia, J., Chen, X. et al. Macrosegregation Induced by Floating Grains in Direct-Chill Casting of Aluminum Alloys. Metall Mater Trans B 52, 1930–1936 (2021). https://doi.org/10.1007/s11663-021-02142-5

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