Jingyun Fu, Guofu Xu
Aging-induced precipitation strongly affects the corrosion behavior of Al – Li alloys, yet intergranular corrosion (IGC) and stress corrosion cracking (SCC) may respond differently to changes in precipitation and grain-boundary microstructure. In this work, the precipitation behavior, grain-boundary microchemistry, electrochemical response, corrosion-induced hydrogen absorption, IGC susceptibility, and SCC behavior of 2050 Al – Li alloy subjected to T6, T8, and double aging treatments were systematically investigated. T8 aging promoted the formation of fine and densely distributed intragranular T1 precipitates through deformation-assisted nucleation, whereas double aging produced coarser intragranular T1 precipitates and more discontinuous grain-boundary precipitation. The maximum IGC depth decreased from 190.08 μm under T6 aging to 113.12 μm under double aging, indicating a marked improvement in IGC resistance. In contrast, the SCC susceptibility index increased from 10.11% under T6 aging to 19.15% under double aging, while the T8 alloy showed intermediate behavior. The results suggest that IGC propagation is mainly associated with the continuity of the electrochemically active grain-boundary path formed by grain-boundary precipitates and adjacent solute redistribution. By comparison, SCC is influenced by the combined effects of interfacial electrochemical behavior, stress-assisted localized dissolution, and hydrogen-related processes. Consequently, the IGC and SCC resistance rankings show opposite trends under the investigated aging conditions.
@article{5c877b30-5667-4f36-bb57-72374ebca667,
title={Distinct microstructural contributions to intergranu 2026 Journal of Alloys },
author={Jingyun Fu and Guofu Xu},
year={2026},
language={en}
}TY - JOUR TI - Distinct microstructural contributions to intergranu 2026 Journal of Alloys AU - Jingyun Fu AU - Guofu Xu PY - 2026 LA - en ER -
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