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Microstructural evolution of penetrated Zn and its role in adhesive strength of galvannealed steels
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DOI：10.1016/j.matdes.2025.115395.png)
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Abstract
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• Zn penetration enhances adhesive strength in galvannealed steel coatings. • Morphological evolution of Zn was clarified, from droplet formation to Γ/ Γ1 phase development • Adhesion is governed by dual mechanisms: mechanical interlocking in GB-free regions and anchoring via Γ phase formation at Zn-penetrated GBs. • Thermodynamic analysis revealed that Γ-phase formation causes significant volumetric expansion; this expansion is inferred to generate compressive stress and thereby reinforce anchoring at GBs.
Keywords:
Galvannealed steel
Intermetallic compound
Adhesion
Microstructure
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