How would the deformation bands affect recrystallization in pure aluminium?

• Published in: Materials & design 2021-11, Vol.209, p.109960, Article 109960
• Main Authors: Luan, Qinmeng, Wang, Jianglong, Huang, Yan, Balint, Daniel S., Jiang, Jun
• Format: Article
• Language: English
• Subjects: Deformation band; Grain growth; Grain nucleation; Phase-field model; Recrystallization
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2021.109960

[Display omitted] •The initial grain nucleation prefers to occur inside of the DBs in the comparison with grain boundaries.•DB is demonstrated to be the source of orientations and positions for the nucleated grains.•The area fraction of DBs has a positive correlation with the number of nucleated grains which would contribute to the RX rate.•The developed KWC phase-field model successfully calculated the kinetics of the RX process in different microstructures. Deformation bands (DBs), formed after plastic deformation, are known to have an impact on the recrystallization (RX) process. The exact mechanisms of how DBs influence grain nucleation and grain growth remain unclear. In this paper, deformed single and multicrystal pure aluminium samples are annealed to explore the likely effects of DBs on the grain nucleation and the subsequent grain growth. Regarding the prediction of the recrystallized (RXed) texture, it is noticeable that the orientations of nucleated grains nearby DB are originated from the orientation in DB. Regarding the nucleated positions, it is demonstrated that potential nucleation sites are more likely located in DBs in comparison with the initial grain boundary. Regarding the rate of RX, the number of nucleated grains is also predicted to have a strong positive correlation with the area fraction of DBs, which would consequently affect the kinetics of the grain growth in the deformed microstructure. All the above observations imply that the RX process is strongly controlled by the ensemble characteristics of DBs rather than the initial grain boundaries.