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Phase Evolution and Diffusion Mechanism in Zn/Mg/Zn Coatings by PVD.

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Title: Phase Evolution and Diffusion Mechanism in Zn/Mg/Zn Coatings by PVD.
Authors: Liu, Xin1 (AUTHOR), Zhao, Xingyuan1 (AUTHOR) CisriZhaoxy@outlook.com, Liu, Qiuyuan1 (AUTHOR), Zhang, Ziyue1 (AUTHOR), Zhang, Qifu1 (AUTHOR)
Source: Journal of Materials Engineering & Performance. Jun2026, Vol. 35 Issue 22, p22240-22249. 10p.
Subjects: Physical vapor deposition, Solid-state phase transformations, Diffusion control, Surface coatings, Ab-initio calculations, Metal coating, Intermetallic compounds, Heat treatment
Abstract: This study investigates the diffusion behavior and intermetallic phase evolution in Zn/Mg/Zn multilayer coatings fabricated via physical vapor deposition (PVD). Post-deposition annealing at 250-350 °C was employed to drive the solid-state alloying process. Experimental characterization like SEM, EDS, XRD, etc reveals that significant interdiffusion occurs above 300 °C, transforming the distinct trilayer structure into a multiphase alloy coating. Crucially, first-principles calculations clarify the phase selection mechanism: while the Mg4Zn7 phase is thermodynamically favorable to nucleate, it fails to satisfy the Born criteria for shear stability. Consequently, Mg4Zn7 acts as a mechanically metastable kinetic precursor, rapidly transforming into the robust MgZn2 and Mg2Zn11 phases. These findings provide a theoretical framework for controlling phase evolution in high-performance Zn-Mg alloy coatings. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study investigates the diffusion behavior and intermetallic phase evolution in Zn/Mg/Zn multilayer coatings fabricated via physical vapor deposition (PVD). Post-deposition annealing at 250-350 °C was employed to drive the solid-state alloying process. Experimental characterization like SEM, EDS, XRD, etc reveals that significant interdiffusion occurs above 300 °C, transforming the distinct trilayer structure into a multiphase alloy coating. Crucially, first-principles calculations clarify the phase selection mechanism: while the Mg4Zn7 phase is thermodynamically favorable to nucleate, it fails to satisfy the Born criteria for shear stability. Consequently, Mg4Zn7 acts as a mechanically metastable kinetic precursor, rapidly transforming into the robust MgZn2 and Mg2Zn11 phases. These findings provide a theoretical framework for controlling phase evolution in high-performance Zn-Mg alloy coatings. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-026-13172-y