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Structural and Mechanical Properties of Directionally Solidified Al-Si Alloys

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Abstract

This review covers research aimed at finding the optimum composition and growth rate to obtain a highly modified Al-Si alloy using directional solidification. Investigations of microstructure and mechanical properties as a function of Si content and growth rate are analyzed. These works show that the composition yielding a eutectic microstructure changes considerably with increasing solidification rate in the range of 102-104 μm/s. The increase in ultimate tensile strength with increasing Si content up to that giving a completely eutectic microstructure is explained by a redistribution of volume content of α-Al and eutectic. The increase in tensile strength with increasing rate is explained by a decrease in microstructural scale accompanying the transformation of flake-to-fiber eutectic microstructure. The optimal fine fiber structure without any primary crystals of Al-Si alloy at a given Si content is obtained at the solidification rate giving a completely eutectic microstructure at that composition. Hypereutectic alloys can be fully modified using rapid cooling at such solidification rate that causes coupled growth of the eutectic for given composition of the alloy. Additional Sr modification results in a super-modified structure, high tensile strength and record high elongation.

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Acknowledgments

The authors are very appreciative for the valuable comments and suggestions provided by Prof. W.R. Wilcox, Clarkson University, Potsdam, NY.

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  1. Ioffe Institute, Politekhnicheskaya Str. 26, Saint Petersburg, 194021, Russia

    S. P. Nikanorov & V. N. Osipov

  2. Clarkson University, Potsdam, NY, 13699-5700, USA

    L. I. Regel

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  1. S. P. Nikanorov
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Nikanorov, S.P., Osipov, V.N. & Regel, L.I. Structural and Mechanical Properties of Directionally Solidified Al-Si Alloys. J. of Materi Eng and Perform 28, 7302–7323 (2019). https://doi.org/10.1007/s11665-019-04414-3

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