Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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In-Situ SEM Observation and DIC Strain Analysis for Deformation and Cracking of Hot-Dip ZnMgAl Alloy Coating

  • Naoki Takata (Department of Materials Process Engineering, Nagoya University) ;
  • Hiroki Yokoi (Department of Materials Process Engineering, Nagoya University) ;
  • Dasom Kim (Department of Materials Process Engineering, Nagoya University) ;
  • Asuka Suzuki (Department of Materials Process Engineering, Nagoya University) ;
  • Makoto Kobashi (Department of Materials Process Engineering, Nagoya University)
  • Received : 2024.01.12
  • Accepted : 2024.03.24
  • Published : 2024.04.30
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Abstract

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 three-phase eutectic of fine Al (fcc), Zn (hcp), and Zn2Mg phases surrounding the primary solidified Al phases. The relatively coarsened Zn2Mg 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 Zn2Mg phase. The results indicated high deformability of the multi-phase microstructure of the ZnMgAl-alloy coating.

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References

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