Mehdi Maghsoudi, Antonio Vazquez Prudencio, Qing Chen, Anne Kvithyld, Snorri Ingvarsson, Kristjan Leosson
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引用次数: 0
摘要
使用原位激光诱导击穿光谱(LIBS)测量了熔体温度范围为 685 °C 至 790 °C 的含 0.6 wt pct 镁的熔融铝合金。随着熔体温度的升高,观察到镁的 LIBS 发射信号呈指数增长,这种现象以前被认为是由于熔体表面上方存在镁蒸气所致。在此,我们展示了镁信号的这种温度依赖性如何受到熔体中存在第二种合金元素的影响。对于稀三元铝合金 Al-Mg-M(M = Si、Zn 或 Sn),发现镁信号的气相贡献变化与附加合金元素的浓度呈线性相关,但在符号和大小上有所不同。还研究了含有第二组合金元素(M = Be、Ca 或 Sr)的三元合金,已知这些元素可抑制熔体氧化。这些元素的存在对 Mg LIBS 信号的气相成分有强烈的减弱作用。我们将这种降低归因于含 Be、Ca 或 Sr 的氧化物的形成,这些氧化物有效地抑制了镁从熔体向表面和气相的传输。
The Influence of Alloying Elements on Mg Vapor Pressure in Liquid Ternary Aluminum Alloys Studied by Laser-Induced Breakdown Spectroscopy
In-situ laser-induced breakdown spectroscopy (LIBS) was used for measurements on molten aluminum alloys containing 0.6 wt pct magnesium in the melt temperature range 685 °C to 790 °C. With increasing melt temperature, an exponential growth of magnesium LIBS emission signals was observed, a phenomenon that has previously been attributed to the presence of Mg vapor above the melt surface. Here we show how this temperature dependence of the magnesium signal is affected by the presence of a second alloying element in the melt. For dilute ternary aluminum alloys Al–Mg–M, with M = Si, Zn, or Sn, the change in vapor-phase contribution to the Mg signal was found to be linearly correlated with the concentration of the additional alloying element but differing in sign and magnitude. Ternary alloys containing group-II alloying elements (M = Be, Ca, or Sr), known to inhibit oxidation of the melt, were also studied. The presence of these elements had a strongly reducing effect on the vapor-phase component of the Mg LIBS signal. We attribute this decrease to the formation of Be, Ca, or Sr-containing oxides that effectively inhibit the transport of Mg from the melt to the surface and into the vapor phase.