预回复处理对过饱和Al-Mn合金再结晶动力学的影响

摘要

The effect of pre-recovery on the recrystallization kinetics of a supersaturated Al-Mn alloy annealed at 530 °C was investigated. The results show that the pre-recovery treatment can lead to faster recrystallization kinetics at the initial stage but cause sluggish recrystallization at the later stage. This different recrystallization behavior is explained by the formation of precipitates-free zones and the consumption of driving force during the pre-recovery treatment. The promoted recrystallization at the early stage can be interpreted by the promotion of recrystallization nucleation through sub-grain growth to a critical size inside precipitates-free zones. A simple model is presented to describe the nucleation of recrystallization with pre-recovery treatment in the supersaturated Al-Mn alloys.%研究预回复处理对 Al-Mn 合金再结晶动力学的影响.研究结果表明,预回复过程中在初生相或晶界附近形成2-3 μm无析出带,该区域内的亚晶容易长大成为有效的再结晶核心,提高再结晶形核率;同时,预回复消耗形变储能,并在晶粒内部析出大量的细小颗粒状Al12(Fe,Mn)3Si相和针状Al6Mn相,降低晶粒长大的净驱动力,减缓了晶粒长大速度.因此,在450 °C预回复处理状态下,在530 °C退火时形核率提高导致早期的再结晶动力学相对较快,而晶粒长大速度减缓导致晚期的再结晶动力学相对较慢.