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

doi:10.1007/s40195-021-01327-w

Abstract

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.

Key words: Solidification, Synchrotron radiography, Intermetallic compounds, Crystal growth, Morphology

Zongye Ding, Qiaodan Hu, Fan Yang, Liao Yu, Tianxing Yang, Naifang Zhang, Wenquan Lu, Jingwei Yang, Jian Qiao, Jianguo Li. Unveiling the Growth Mechanism of Faceted Primary Al₂Cu with Complex Morphologies During Solidification[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(1): 124-132.

Figures/Tables 7

Fig. 1 Real-time images of the growth behaviors of faceted primary Al2Cu holding for 20 min a and solidified at different cooling time b-j

Fig. 2 In situ images of faceted Al2Cu IMCs with branches (Type II) during solidification

Fig. 3 SEM images and the corresponding phase map and pole figures observed from a, b longitudinal-section; c, d cross section

Fig. 4 a SEM image of the faceted Al2Cu with branches after solidification; b c schematic diagrams of the crystal growth of Al2Cu along?<?100?>?direction

Fig. 5 a Crystal model of Al2Cu, b total density of states of Al2Cu, c low index surfaces (001) and (110) of Al2Cu crystal, z direction is the relaxation direction

Fig. 6 Schematic diagram of rod-like Al2Cu clusters with different morphologies: a single rod-like crystal, b hollow rod, c-f ( hollow rod with dissolution of 1, 2, 3, and 4 sides, respectively; g schematic diagram of two adjacent hollow Al2Cu rods

Fig. 7 Schematic diagram of branched Al2Cu growth and evolution: a single crystal, b formation of new crystal along [100] direction, c branched Al2Cu with multiple crystals

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

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