The recrystallization temperature of AZ31B magnesium alloy isn't a single value, but a range influenced by factors like initial microstructure and deformation conditions. Dynamic recrystallization can start above 250°C during deformation, while static recrystallization, occurring after deformation, typically happens between 300-400°C. However, these are general guidelines, and the actual recrystallization behavior can vary depending on specific processing conditions and desired microstructural properties. Studies like [1, 2, 3] provide further insights into the recrystallization mechanisms and kinetics in AZ31B.

[1] Recrystallization and Anisotropy of AZ31 Magnesium Alloy by Asynchronous Rolling - MDPI: https://www.mdpi.com/2075-4701/13/9/1631

[2] Temperature Influence on Formability and Microstructure of AZ31B during Electric Hot Temperature-Controlled Incremental Forming - PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC7915426/

[3] Dislocation-driven recrystallization in AZ31B magnesium alloy imaged by quasi-in situ EBSD in annealing experiments - HAL Um - Université de Montpellier: https://hal.umontpellier.fr/hal-02777460v1/file/Lopez-Sanchez_etal_MC2020-HAL.pdf