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<p>Mg-Zn-Cu alloys are a new class of magnesium alloys known for their good strength and thermal conductivity, making them potential candidates for structural-functional integration in future applications. However, the development and use of Mg-Zn-Cu alloys have been hindered by poor casting properties and a high susceptibility to hot tearing. In this study, the hot tearing susceptibility of Mg-5Zn-xCu-0.5Zr (x = 0, 0.5, 1, 2) alloys was investigated using a “T-shaped” hot tearing testing system, a hot tearing indicator, thermal analysis, and fluidity tests. The microstructure of the alloys was characterized via SEM, TEM, and EBSD techniques. The experimental results revealed that the flow length of the alloys increased from 235 mm to 556 mm, while the critical solidification time (vulnerable interval) decreased from 727.1 s to 413.6 s with increasing Cu content. Additionally, higher Cu content was found to refine the alloy grains, improve feeding ability, and enhance hot tearing resistance. The Mg-5Zn-2Cu-0.5Zr alloy exhibited the lowest susceptibility to hot tearing, driven by the combined effects of these factors.</p>

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Effect of Cu Addition on the Hot Tearing Susceptibility and Fluidity of Mg-5Zn-xCu-0.5Zr Alloys

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Wenyuan Cong,
  • Feng Wang,
  • Shengwei Bai,
  • Xudong Du,
  • Zhi Wang,
  • Le Zhou,
  • Ziqi Wei,
  • Pingli Mao,
  • Jinwei Li

摘要

Mg-Zn-Cu alloys are a new class of magnesium alloys known for their good strength and thermal conductivity, making them potential candidates for structural-functional integration in future applications. However, the development and use of Mg-Zn-Cu alloys have been hindered by poor casting properties and a high susceptibility to hot tearing. In this study, the hot tearing susceptibility of Mg-5Zn-xCu-0.5Zr (x = 0, 0.5, 1, 2) alloys was investigated using a “T-shaped” hot tearing testing system, a hot tearing indicator, thermal analysis, and fluidity tests. The microstructure of the alloys was characterized via SEM, TEM, and EBSD techniques. The experimental results revealed that the flow length of the alloys increased from 235 mm to 556 mm, while the critical solidification time (vulnerable interval) decreased from 727.1 s to 413.6 s with increasing Cu content. Additionally, higher Cu content was found to refine the alloy grains, improve feeding ability, and enhance hot tearing resistance. The Mg-5Zn-2Cu-0.5Zr alloy exhibited the lowest susceptibility to hot tearing, driven by the combined effects of these factors.