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<p>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&#xa0;°C was employed to drive the solid-state alloying process. Experimental characterization like SEM, EDS, XRD, etc reveals that significant interdiffusion occurs above 300&#xa0;°C, transforming the distinct trilayer structure into a multiphase alloy coating. Crucially, first-principles calculations clarify the phase selection mechanism: while the Mg<sub>4</sub>Zn<sub>7</sub> phase is thermodynamically favorable to nucleate, it fails to satisfy the Born criteria for shear stability. Consequently, Mg<sub>4</sub>Zn<sub>7</sub> acts as a mechanically metastable kinetic precursor, rapidly transforming into the robust MgZn<sub>2</sub> and Mg<sub>2</sub>Zn<sub>11</sub> phases. These findings provide a theoretical framework for controlling phase evolution in high-performance Zn-Mg alloy coatings.</p>

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

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Xin Liu,
  • Xingyuan Zhao,
  • Qiuyuan Liu,
  • Ziyue Zhang,
  • Qifu Zhang

摘要

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.