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Unveiling the Growth Mechanism of Faceted Primary Al2Cu with Complex Morphologies During Solidification

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The growth characteristic of primary faceted Al2Cu intermetallic compounds (IMCs) during solidification was observed directly by synchrotron radiography. The formation and transition mechanisms of Al2Cu IMCs with diverse morphologies were elucidated by first-principle calculations combined with electron backscatter diffraction analysis. The Al2Cu crystals preferred to grow along the [001] direction and were bounded by {110} planes with the lowest surface energy. The faceted Al2Cu rod-like clusters consisted of multiple crystals with complete rod, hollowness and partial sides, which was attributed to the increase in strain energy and solute redistribution during solidification. The faceted Al2Cu with branches was characteristic with the perpendicular relationship between the main branches and side steps and partial coalescence at the junction, which was ascribed to the continuous propagation and growth of newly formed crystals along the diagonal direction.

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Acknowledgements

This work is financially supported by the National Key Research and Development Program (No. 2017YFA0403800), the National Natural Science Foundation of China-Excellent Young Scholars (No. 51922068), the National Natural Science Foundation of China (Nos. 51727802, 51821001, 51904187), the Project funded by China Postdoctoral Science Foundation (No. 2019M661500). The support of synchrotron radiation phase-contrast imaging by the BL13W1 beam line of Shanghai Synchrotron Radiation Facility (SSRF), China, is gratefully acknowledged.

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Correspondence to Qiaodan Hu or Fan Yang.

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Ding, Z., Hu, Q., Yang, F. et al. Unveiling the Growth Mechanism of Faceted Primary Al2Cu with Complex Morphologies During Solidification. Acta Metall. Sin. (Engl. Lett.) 35, 124–132 (2022). https://doi.org/10.1007/s40195-021-01327-w

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  • DOI: https://doi.org/10.1007/s40195-021-01327-w

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