Anisotropic Inter-granular Corrosion Behaviors and Microstructures of AlMgSiCu Alloy Sheets Made by Thermal–Mechanical Treatments

Autor: J.H. Chen, Liu Lie, C.L. Wu, Y.X. Lai, Zhengwei Zhang
Rok vydání: 2021
Předmět:
Zdroj: Acta Metallurgica Sinica (English Letters). 35:275-284
ISSN: 2194-1289
1006-7191
Popis: This study investigates the microstructure and local corrosion behavior of an Al–Mg–Si–Cu alloy, which has been subjected to cold-rolling with different deformation strain ratios (DSRs) and followed by artificial aging. Accelerated corrosion tests show that peak-aged samples with a small DSR (5–10%) are sensitive to inter-granular corrosion (IGC) along both the normal and rolling directions. When the DSR increases to medium strength (20–40%), IGC sensitivity decreases along both directions and corrosion propagates anisotropically. When the DSR is 60–80%, IGC sensitivity along the normal direction continues to decrease, but increases along the rolling direction, indicating pronounced corrosion anisotropy. Microstructural characterization reveals the decreased IGC sensitivity is mainly attributed to a reduction in element segregation at high-angle grain boundaries and the kinked and discontinuous grain boundary corrosion paths. The increased IGC sensitivity along the rolling direction could be related to the significantly flattened grains.
Databáze: OpenAIRE
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