基于晶格储存能的航空铝合金腐蚀行为研究

采用多种电子显微技术对AA2024-T3航空铝合金的局部腐蚀行为进行研究。结果表明:AA2024-T3铝合金的局部腐蚀主要以晶间腐蚀的形式出现，相对于晶界沉淀相，晶格储存能更为显著地影响晶间腐蚀的发展，促使其优先发生在晶格储存能更高的晶粒周围。研究结果有助于提高对航空铝合金晶间腐蚀机理的认识，并为航空铝合金的设计提供理论指导，对保障航空安全具有重要意义。

Corrosion Behavior of Aerospace Aluminum Alloy Based on Grain-stored Energy

In the present work, localized corrosion behaviour of aerospace AA2024-T3 aluminium alloy has been investigated using a wide range of electron microscopy techniques. It was revealed that localized corrosion of AA2024-T3 alloy tends to occur in form of intergranular attack. Further, it was also noticed that during intergranular corrosion development, grain-stored energy instead of grain boundary precipitate plays a more crucial role. Intergranular corrosion selectively attacks grain boundaries surrounding grain of higher stored energy rather than that of lower stored energy. The findings could advance the under-standing of intergranular corrosion mechanism of aerospace aluminium alloys and, more importantly, provide theoretical guidance for aerospace alloy design to ensure the safe operation of aircraft.