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Thermodynamic calculations were employed to estimate activities and phase composition of the oxide layer for ternary dilute aluminumAluminum magnesium alloysMagnesium alloy; Al–Mg–M (M = Si, Zn, Zr, Ti, Be, or Ca). Previously, it has been reported that adding a ternary element modifies the vapor phase of Mg above the melt surfaceSurface. When Be or Ca was added, a strong reductionReduction of Mg partial pressure was recorded for small concentrations of the ternary element, in contrast with Si or Zn, where the effect was orders of magnitude smaller. This study aims to use Thermo-Calc simulationsSimulation to reveal the distributionDistribution of alloying elements between the liquid metal, oxide layer, and vapor phase and predict the phase composition of oxide layers. The variation of the Mg vapor phase can be linked, at least in part, to the formation of oxide layers on the melt surfaceSurface that may inhibit the diffusion of Mg.

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On the Influence of Oxide Layer Formation and Alloying in the Mg Vapor Pressure  for Ternary Dilute Al–Mg Alloys

  • 会议论文

  • 发表日期：

    2025年

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  • Antonio Vazquez Prudencio,
  • Mehdi Maghsoudi,
  • Qing Chen,
  • Anne Kvithyld,
  • Snorri Ingvarsson,
  • Kristjan Leosson

摘要

Thermodynamic calculations were employed to estimate activities and phase composition of the oxide layer for ternary dilute aluminumAluminum magnesium alloysMagnesium alloy; Al–Mg–M (M = Si, Zn, Zr, Ti, Be, or Ca). Previously, it has been reported that adding a ternary element modifies the vapor phase of Mg above the melt surfaceSurface. When Be or Ca was added, a strong reductionReduction of Mg partial pressure was recorded for small concentrations of the ternary element, in contrast with Si or Zn, where the effect was orders of magnitude smaller. This study aims to use Thermo-Calc simulationsSimulation to reveal the distributionDistribution of alloying elements between the liquid metal, oxide layer, and vapor phase and predict the phase composition of oxide layers. The variation of the Mg vapor phase can be linked, at least in part, to the formation of oxide layers on the melt surfaceSurface that may inhibit the diffusion of Mg.