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通过3种不同热处理工艺使一种Al-Mn-Fe-Si合金获得了不同固溶液和不同尺寸及数量的弥散析出相,包括铸造态,一种富含高密度、细小、弥散相的状态,另外一种状态则仅有少量、相对粗大的弥散相。采用EBSD技术系统研究冷轧后退火过程中微观组织的演变以及初始组织状态对再结晶动力学、再结晶晶粒形貌和织构的影响。结果表明,再结晶动力学、最终微观组织和织构由加工条件和合金的初始组织和固溶度决定。高密度弥散析出相阻止形核,显著阻碍软化过程,最终得到粗大的狭长晶粒以及P和ND-rotated cube织构。在没有预先存在的细小、稠密的弥散相并且在退火过程中弥散相析出数量很少的时候则能更快完成再结晶并得到均匀、细小的等轴晶以及显著的立方织构。
Three Al-Mn-Fe-Si alloys with different solid solution and different size and number of dispersed phases were obtained by three different heat treatment processes, including cast state, a state of high density, fine and dispersed phase, The other is only a small amount of state, relatively coarse dispersed phase. The evolution of microstructure and the effect of initial microstructure on recrystallization kinetics, recrystallized grain morphology and texture during annealing after cold-rolling were investigated by EBSD technique. The results show that the recrystallization kinetics, final microstructure and texture are determined by the processing conditions and the initial microstructure and solid solubility of the alloy. The high-density disperse phase precipitates prevent nucleation, significantly hindering the softening process, resulting in coarse elongated grains and P and ND-rotated cube textures. In the absence of pre-existing small, dense dispersed phases and the small amount of dispersed precipitates during the annealing process, recrystallization can be completed more quickly and uniform and fine equiaxed grains with pronounced cubic texture can be obtained.