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<p>This research systematically investigated the influence of 0.2&#xa0;wt.% calcium (Ca) addition on the microstructural evolution, corrosion behavior, and compressive mechanical properties of Mg-1.5Sm-1Zn alloy along both the extrusion direction (ED) and transverse direction (TD). Experimental results demonstrated that the addition of Ca increased the area fraction of secondary phases (from 3.08 ~ 3.65% to 4.79 ~ 5.57%). Both before and after Ca addition, these secondary phases consisted of Mg<sub>2</sub>Sm<sub>2</sub>Zn<sub>3</sub> and Mg<sub>13</sub>Sm<sub>3</sub>Zn<sub>30</sub>, with Ca predominantly enriched within them as solute atoms. In terms of corrosion performance, the Mg-1.5Sm-1Zn-0.2Ca-ED sample exhibited optimal corrosion resistance, characterized by a corrosion rate of 0.69&#xa0;mm·y<sup>−1</sup> and a charge transfer resistance (R<sub>ct</sub>) of 1080.33&#xa0;Ω&#xa0;cm<sup>2</sup>. These values were significantly superior to both Ca-free alloys and the TD sample of the same composition. The underlying mechanisms were attributed to: (1) A more uniform distribution of secondary phases, which alleviated galvanic corrosion; (2) A stronger basal texture orientation, associated with lower surface energy; (3) Formation of a denser and more protective oxide film. Compared to the Ca-free alloys, the Ca-containing alloys exhibited average increases of approximately 24% in compressive yield strength (CYS) and 17.5% in ultimate compressive strength (UCS). This enhancement was primarily attributed to the increase in the critical resolved shear stress (CRSS, τ<sub>0</sub>) for both basal slip and {10–12} tensile twinning, as verified by visco-plastic self-consistent (VPSC) simulations.</p> Graphical Abstract <p></p>

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Clarifying the roles of trace Ca addition and grain orientation on the microstructural evolution, corrosion behavior, and mechanical performance of as-extruded Mg-1.5Sm-1Zn bars

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yanfu Chai,
  • Zhengyu Jiang,
  • Jun Xu,
  • Yuchen Dou,
  • Huabao Yang,
  • Yan Zhang,
  • Bin Jiang,
  • Qinghang Wang

摘要

This research systematically investigated the influence of 0.2 wt.% calcium (Ca) addition on the microstructural evolution, corrosion behavior, and compressive mechanical properties of Mg-1.5Sm-1Zn alloy along both the extrusion direction (ED) and transverse direction (TD). Experimental results demonstrated that the addition of Ca increased the area fraction of secondary phases (from 3.08 ~ 3.65% to 4.79 ~ 5.57%). Both before and after Ca addition, these secondary phases consisted of Mg2Sm2Zn3 and Mg13Sm3Zn30, with Ca predominantly enriched within them as solute atoms. In terms of corrosion performance, the Mg-1.5Sm-1Zn-0.2Ca-ED sample exhibited optimal corrosion resistance, characterized by a corrosion rate of 0.69 mm·y−1 and a charge transfer resistance (Rct) of 1080.33 Ω cm2. These values were significantly superior to both Ca-free alloys and the TD sample of the same composition. The underlying mechanisms were attributed to: (1) A more uniform distribution of secondary phases, which alleviated galvanic corrosion; (2) A stronger basal texture orientation, associated with lower surface energy; (3) Formation of a denser and more protective oxide film. Compared to the Ca-free alloys, the Ca-containing alloys exhibited average increases of approximately 24% in compressive yield strength (CYS) and 17.5% in ultimate compressive strength (UCS). This enhancement was primarily attributed to the increase in the critical resolved shear stress (CRSS, τ0) for both basal slip and {10–12} tensile twinning, as verified by visco-plastic self-consistent (VPSC) simulations.

Graphical Abstract