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<p>In this study, the effect of heat-treatment on the microstructure, wear, and corrosion behavior of Mg-1Zn-2Gd-0.4Zr (wt%) and Mg-1Zn-2Dy-0.4Zr (wt%) alloys were studied. The alloys were undergone heat treatment (T6) at different aging conditions. The microstructural analysis revealed that significant amount of secondary phase precipitation after heat treatment in both alloys, which lead to 20 to 25% increase in the hardness. Wear tests were performed between 200 ℃, and 400 ℃, at different loading conditions (10&#xa0;N, 20&#xa0;N), revealed improved wear resistance in Mg-Zn-Gd alloy samples compared to Mg-Zn-Dy alloy. Further improvement in the wear resistance was also observed after heat treatment. Delamination, abrasion, and oxidation were found to be dominant wear mechanisms in these alloys. Immersion corrosion tests carried out in 3.5 wt% NaCl solution demonstrated that the heat treatment can significantly improve the corrosion resistance. This is primarily due to the changes in microstructure, i.e., uniform distribution of secondary phases (LPSO phases) after heat treatment. Among the two alloys, Mg-Zn-Gd was found to exhibit lower corrosion rate than Mg-Zn-Dy in both as cast and heat-treated conditions. This shows the tribological and corrosion advantage of microstructural refinement and specific long period stacking ordered phase formations in the alloy system.</p>

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Heat treatment of Mg-Zn-Gd and Mg-Zn-Dy alloys for enhanced wear and corrosion properties

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月29日

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  • Rakesh K.R,
  • Pratyush Mohanty,
  • Srikanth Bontha,
  • Ramesh M.R,
  • Vamsi Krishna Balla

摘要

In this study, the effect of heat-treatment on the microstructure, wear, and corrosion behavior of Mg-1Zn-2Gd-0.4Zr (wt%) and Mg-1Zn-2Dy-0.4Zr (wt%) alloys were studied. The alloys were undergone heat treatment (T6) at different aging conditions. The microstructural analysis revealed that significant amount of secondary phase precipitation after heat treatment in both alloys, which lead to 20 to 25% increase in the hardness. Wear tests were performed between 200 ℃, and 400 ℃, at different loading conditions (10 N, 20 N), revealed improved wear resistance in Mg-Zn-Gd alloy samples compared to Mg-Zn-Dy alloy. Further improvement in the wear resistance was also observed after heat treatment. Delamination, abrasion, and oxidation were found to be dominant wear mechanisms in these alloys. Immersion corrosion tests carried out in 3.5 wt% NaCl solution demonstrated that the heat treatment can significantly improve the corrosion resistance. This is primarily due to the changes in microstructure, i.e., uniform distribution of secondary phases (LPSO phases) after heat treatment. Among the two alloys, Mg-Zn-Gd was found to exhibit lower corrosion rate than Mg-Zn-Dy in both as cast and heat-treated conditions. This shows the tribological and corrosion advantage of microstructural refinement and specific long period stacking ordered phase formations in the alloy system.