轧制驱动-ECA大应变纯铝的强化机理

Strengthening Mechanism of the Large Straining CP Al Processed by Rolling Driven-ECA

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 the large straining CP Al processed by rolling driven-ECA（Equal Channel Angular） was investigated.A theoretical calculation based on XRD analysis and Taylor equation indicates that the dislocation density of the large straining CPAl by rolling driven-ECA is very low.Low angle grain boundary and high angle grain boundary were measured by a crystal micro area orientation analysis technique and the results demonstrate that the low angle grain boundary is much more.Strengthening mechanisms of the large straining CP Al were quantitatively calculated based on the Hall-Petch relationships,and it is concluded that the strengthening mainly comes from the low angle grain boundary.