Effect of Pre-existing T6 Precipitates on the Recrystallization Texture, Dislocation Structure, and Corrosion Behavior of Cold-Rolled AA 6061 Alloy
METALS AND MATERIALS INTERNATIONAL, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s12540-025-02203-3
- Dergi Adı: METALS AND MATERIALS INTERNATIONAL
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Gazi Üniversitesi Adresli: Evet
Özet
AA 6061 alloy is widely used in aerospace and automotive industries due to its high strength, corrosion resistance, and machinability. This study investigates how pre-existing T6 precipitates influence the microstructural evolution and corrosion behavior during secondary thermomechanical processing. T6-treated AA 6061 samples were subjected to 75% cold deformation followed by recrystallization heat treatments at 200 degrees C, 300 degrees C, and 400 degrees C for 2, 4, and 6 h. Microstructural evolution was analyzed via EBSD and XRD, while hardness and electrochemical corrosion tests were conducted. EBSD analysis revealed that HAGB fraction increased from 10% to 73% and average grain size grew from 6.5 mu m to 47.4 mu m with increasing temperature and time, confirming progressive recrystallization. Results show that the initial T6 microstructure significantly influences the development of texture during both deformation and recrystallization. Low-temperature annealing (200 degrees C-300 degrees C) improves corrosion resistance through recovery and partial recrystallization, while high-temperature treatment (400 degrees C) severely degrades corrosion performance despite achieving full recrystallization, attributed to precipitate coarsening effects.