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采用Gleeble-3500热模拟试验机对喷射成形Al-9Mg-0.5Mn合金进行等温热压缩试验,研究了变形温度、应变和应变速率对合金动态再结晶行为的影响。结果表明,合金在热压缩变形初期,加工硬化起主导作用,流变应力随变形程度的增加迅速增大;但随着应变增加,动态再结晶是主要的软化机制;变形温度越高,合金变形更均匀,合金的储存能更高,动态再结晶的形核和长大过程更快;应变速率越小,再结晶核心及亚结构有充分的时间形成和长大,合金发生完全动态再结晶,合金的组织为再结晶组织。
The isothermal hot compression tests of spray-formed Al-9Mg-0.5Mn alloy were carried out on a Gleeble-3500 thermal simulator. The effects of deformation temperature, strain and strain rate on the dynamic recrystallization behavior of the alloy were investigated. The results show that during the initial stage of hot compression deformation, the work hardening plays a leading role, and the flow stress increases rapidly with the increase of the deformation degree. However, dynamic recrystallization is the main softening mechanism as the strain increases. The higher the deformation temperature is, More uniform, alloy storage can be higher, the dynamic recrystallization nucleation and growth process faster; the smaller the strain rate, the recrystallization core and substructure have sufficient time to form and grow, the alloy completely dynamic recrystallization occurs, The organization of the alloy is recrystallized.