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( Naoki Takata ),( Hiroki Yokoi ),( Dasom Kim ),( Asuka Suzuki ),( Makoto Kobashi ) 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.2
An attempt was made to apply digital image correlation (DIC) strain analysis to in-situ scanning electron microscopy (SEM) observations of bending deformation to quantify local strain distribution inside a ZnMgAl-alloy coating in deformation. Interstitial-free steel sheets were hot-dipped in a Zn-3Mg-6Al (mass%) alloy melt at 400 ℃ for 2 s. The specimens were deformed using a miniature-sized 4-point bending test machine inside the SEM chamber. The observed in situ SEM images were used for DIC strain analysis. The hot-dip ZnMgAl-alloy coating exhibited a solidification microstructure composed of a threephase eutectic of fine Al (fcc), Zn (hcp), and Zn<sub>2</sub>Mg phases surrounding the primary solidified Al phases. The relatively coarsened Zn<sub>2</sub>Mg phases were locally observed inside the ZnMgAl-alloy coating. The DIC strain analysis revealed that the strain was localized in the primary solidified Al phases and fine eutectic microstructure around the Zn<sub>2</sub>Mg phase. The results indicated high deformability of the multi-phase microstructure of the ZnMgAl-alloy coating.