Abstract—

The effect of lithium on the structural-phase state of aerospace aluminum alloy 1421 of the Al–Mg–Li system prepared by rapid solidification is studied. Analysis of the composition of the surface layers of alloy samples carried out by means of nuclear reaction analysis establishes that lithium diffuses to the surface at elevated treatment temperatures and its concentration in a thin surface layer (0.1 μm) reaches 38 at %, which is 4.8 times higher than the calculated Li content in the alloy. By measuring the microhardness, strengthening of the samples is determined upon isothermal annealing at a temperature of 400°C, which is caused by the precipitation of metastable lithium-containing phases. The results of X-ray diffraction analysis indicate an increase in the fraction of Li₂O₂ peroxide on the foil surface upon annealing.

中文翻译：

---

锂对热处理过程中快速凝固的 Al-Mg-Li 合金结构相态的影响

摘要——

研究了锂对快速凝固制备的Al-Mg-Li系航空铝合金1421结构相态的影响。通过核反应分析对合金样品表面层的成分进行分析表明，锂在升高的处理温度下扩散到表面，其在薄表面层 (0.1 μm) 中的浓度达到 38 原子％，即 4.8比合金中计算出的锂含量高出数倍。通过测量显微硬度，通过在 400°C 的温度下等温退火确定样品的强化，这是由亚稳态含锂相的沉淀引起的。X射线衍射分析结果表明Li ₂ O ₂的分数增加 退火时箔表面上的过氧化物。