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研究了经过轧制驱动等通道转角大应变加工的商业纯铝的强化机理。基于XRD分析和Taylor公式的定量计算说明,轧制驱动ECA大应变CP Al的内部位错密度很低。通过晶体微区取向分析技术(EBSD)对大应变材料内部的小角度界面和大角度界面进行表征,发现材料内部大多数是小角度晶界;基于Hall-Petch关系对大应变纯铝的强化机理进行定量分析,得出其强化主要来自于小角度晶界强化。
The strengthening mechanism of commercial pure aluminum after large-strain transformation of the channel corner such as rolling drive was studied. Quantitative calculation based on XRD analysis and Taylor’s formula shows that the internal dislocation density of rolling-driven ECA large strain CP Al is very low. The small-angle interface and large-angle interface in large strain materials were characterized by crystal orientation analysis (EBSD). It was found that most of the materials were small-angle grain boundaries. Based on Hall-Petch relationship, the strengthening mechanism of large strain pure aluminum Quantitative analysis showed that its strengthening mainly comes from the small angle grain boundary strengthening.