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Morphologies of Primary Silicon in Hypereutectic Al-Si Alloys: Phase-Field Simulation Supported by Key Experiments

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Abstract

We realized a three-dimensional visualization of the morphology evolution and the growth behavior of the octahedral primary silicon in hypereutectic Al-20wtpctSi alloy during solidification in a real length scale by utilizing the phase-field simulation coupled with CALPHAD databases, and supported by key experiments. Moreover, through two-dimensional cut of the octahedral primary silicon at random angles, different morphologies observed in experiments, including triangle, square, trapezoid, rhombic, pentagon, and hexagon, were well reproduced.

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The financial supports from the National Natural Science Foundation of China (Grant Nos. 51474239 and 51531009) and the National Natural Science Foundation for Youth of China (Grant No. 51301208) are acknowledged. Lijun Zhang acknowledges the project supported by State Key Laboratory of Power Metallurgy Foundation, Central South University, Changsha, China.

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Authors and Affiliations

  1. State Key Lab of Powder Metallurgy, Central South University, Changsha, 410083, China

    Kai Wang (Master Student), Ming Wei (Doctoral Student), Lijun Zhang (Professor) & Yong Du (Professor)

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  1. Kai Wang
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  2. Ming Wei
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  3. Lijun Zhang
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  4. Yong Du
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Correspondence to Lijun Zhang.

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Manuscript submitted August 26, 2015.

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Wang, K., Wei, M., Zhang, L. et al. Morphologies of Primary Silicon in Hypereutectic Al-Si Alloys: Phase-Field Simulation Supported by Key Experiments. Metall Mater Trans A 47, 1510–1516 (2016). https://doi.org/10.1007/s11661-016-3358-1

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