The present research work aimed at evaluating the effect of Ce and La rare earth (RE) additions on the formation of intermetallics in an Al-8.0Si-2.4Cu-0.4Mg-0.4Fe-0.6Mn-0.15Ti alloy (coded D0). These alloys were solidified at a rate of ~0.7°C/s. Microstructural analyses revealed the presence of two types of RE-containing intermetallic phases: (i) a gray phase with a fixed composition of Al₂₁Ti₂RE(Ce/La) and (ii) a white RE-containing intermetallic phase stemming from the reaction of the RE (Ce/La) with Si, Fe, and Cu. The present study aimed as well at studying the influence of the additions of Ce and La elements (0–1.0%) on the high-temperature (250 °C) tensile properties of the Al-8.0Si-2.4Cu-alloys. The results showed that T6-treated alloys, Sr-modified alloys, or those containing Ce/La exhibited UTS values comparable to the solution heat-treated, T5, and T7 alloys.

目前的研究工作旨在评估 Ce 和 La 稀土 (RE) 添加对 Al-8.0Si-2.4Cu-0.4Mg-0.4Fe-0.6Mn-0.15Ti 合金（代码 D0）中金属间化合物形成的影响. 这些合金以 ~0.7°C/s 的速度凝固。显微结构分析表明存在两种类型的含稀土金属间相：(i) 具有固定成分的 Al ₂₁ Ti ₂的灰色相RE(Ce/La) 和 (ii) 由 RE (Ce/La) 与 Si、Fe 和 Cu 反应产生的白色含 RE 金属间相。本研究还旨在研究添加 Ce 和 La 元素 (0-1.0%) 对 Al-8.0Si-2.4Cu 合金的高温 (250 °C) 拉伸性能的影响。结果表明，T6 处理的合金、Sr 改性合金或含有 Ce/La 的合金的 UTS 值与固溶热处理、T5 和 T7 合金相当。