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Dual Modification of Hypereutectic Al–Si Alloy and Spheroidization Mechanism of Primary Silicon with Eu Addition

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Abstract

The effects of Eu addition on the silicon phase and mechanical properties of hypereutectic Al–16Si alloys have been investigated using optical microscopy, scanning electron microscopy, electron probe microanalysis map**, and high-angle annular dark-field scanning transmission electron microscopy. In addition, the mechanism of spheroidization of the primary silicon was studied. The addition of 0.8% Eu generated a refined spheroidal primary silicon and a fibrous eutectic silicon in the hypereutectic Al–16Si alloys. The ultimate tensile strength and elongation were increased by 16.26% and 166%, respectively. The refinement of the primary silicon was caused by a constitutional undercooling of the Eu element. The spheroidization of primary silicon can be attributed to an impurity induced twinning mechanism and a poisoning of the twin plane re-entrant due to the adsorption of Eu at the parallel twins, intersection twins and 141° twin plane re-entrant.

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Acknowledgments

The authors thank the Key Scientific and Technological Project of Henan Province (NO. 232102231018), Frontier Exploration Projects of Longmen Laboratory (NO. LMQYTSKT005) and the National Key R&D Program of China (NO. 2020YFB2008400). The authors wish to take this opportunity to thank the support of Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology.

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  1. Junliang Guo and Feng Mao have contributed equally to this work and should be considered co-first authors.

Authors and Affiliations

  1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471000, China

    Junliang Guo, Feng Mao, Guoshang Zhang, Po Zhang, Chong Chen, Changji Wang & Liqiang **ao

  2. Longmen Laboratory, Luoyang, 471000, China

    Feng Mao, Guoshang Zhang & Chong Chen

  3. School of Materials Science and Engineering, North University of China, Taiyuan, 030051, Shanxi, China

    Hong Xu

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Guo, J., Mao, F., Zhang, G. et al. Dual Modification of Hypereutectic Al–Si Alloy and Spheroidization Mechanism of Primary Silicon with Eu Addition. Inter Metalcast (2023). https://doi.org/10.1007/s40962-023-01198-0

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