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Comparison of long-term natural aging to artificial aging in Duralumin

机译：长期自然衰老对Duraluman的人工老化的比较

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The understanding of long-term aging of aeronautical materials, in particular aluminium alloys used in the fuselage and structure of aircraft is of extreme importance for airline fleets. In this work, a plate from an old aircraft (Breguet) was retrieved and studied in terms of microstructure and mechanical properties. A comparison was made between this naturally-aged alloy and a modern alloy on which different artificial aging conditions were applied. The old alloy exhibits a precipitation of θ-Al_(2)Cu at grain boundaries and of ?-Al_(2)Cu on dispersoids. This non-expected nanostructure for an alloy in T4 state was attributed to the heat that the plate experienced during the aircraft cycles. However, it is shown that this aging is reversible (after a solution treatment). Moreover, the very long time of outdoors exposure seems to have caused intergranular corrosion causing the early failure during tensile tests on some of the specimens. The artificial aging (low temperature, 100°C for up to 10,000h) applied on the modern 2017A alloy did not allow to reproduce the nanostructure of the old plate, meaning that isothermal conditions for artificial aging might not be appropriate in this case.
机译：了解航空材料长期老化，特别是飞机机身和结构中使用的铝合金对航空公司的极端重要性。在这项工作中，在微观结构和机械性能方面检索和研究来自旧飞机（BREGUET）的板。在这种天然老化的合金和应用不同人工老化条件的现代合金之间进行了比较。旧合金在晶界和分散体上的α-Al_（2）Cu的沉淀物沉淀。 T4状态下合金的该非预期纳米结构归因于飞机循环期间的板材的热量。然而，显示该老化是可逆的（在溶液处理后）。此外，户外暴露的长时间似乎导致晶间腐蚀导致在一些标本上拉伸试验期间的早期失败。在现代2017A合金上施加在现代2017A合金上的人工老化（低温，100℃，高达10,000h）不允许再现旧板的纳米结构，这意味着在这种情况下，人工老龄化的等温条件可能不合适。

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