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<p>The growing need for lightweight materials in the automotive and aerospace industries highlights the importance of developing various new magnesium alloys. The Mg–Bi system offers superior high-temperature properties. This is due to the nature, stability and strengthening role of the Mg<sub>3</sub>Bi<sub>2</sub> intermetallic phase. Additionally, the Mg–Bi system has garnered attention for its potential in precipitation strengthening, grain refinement and cost-effectiveness in alloying. The current study focuses on Mg–5Bi alloy with different Y additions (<i>x</i> = 0, 0.5, 1.5 and 2.5 wt%). Worm-shaped precipitates formed increases in the microstructure with the increase in Y addition. Brinell hardness increases are attributed to the addition of Y, due to the formation of Mg<sub>24</sub>Y<sub>5</sub> intermetallic compound. The tensile properties of Mg–5Bi alloy with different Y additions show that UTS, YS and E% values significantly increase with Y addition, reflecting the combined influence of formation of thermally stabilized Mg<sub>3</sub>Bi<sub>2</sub>, Mg<sub>24</sub>Y<sub>5</sub> and BiY intermetallic compound which influences particle strengthening, grain refinement and solution hardening effect in the alloy.</p>

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Microstructural and Solidification Behavior of Yttrium Added Mg–Bi Alloy

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • S. Jothibasu,
  • R. Rethan Raj,
  • W. Anish,
  • K. K. Ajith Kumar

摘要

The growing need for lightweight materials in the automotive and aerospace industries highlights the importance of developing various new magnesium alloys. The Mg–Bi system offers superior high-temperature properties. This is due to the nature, stability and strengthening role of the Mg3Bi2 intermetallic phase. Additionally, the Mg–Bi system has garnered attention for its potential in precipitation strengthening, grain refinement and cost-effectiveness in alloying. The current study focuses on Mg–5Bi alloy with different Y additions (x = 0, 0.5, 1.5 and 2.5 wt%). Worm-shaped precipitates formed increases in the microstructure with the increase in Y addition. Brinell hardness increases are attributed to the addition of Y, due to the formation of Mg24Y5 intermetallic compound. The tensile properties of Mg–5Bi alloy with different Y additions show that UTS, YS and E% values significantly increase with Y addition, reflecting the combined influence of formation of thermally stabilized Mg3Bi2, Mg24Y5 and BiY intermetallic compound which influences particle strengthening, grain refinement and solution hardening effect in the alloy.