Park Sung-Jin, Muraishi Shinji
Departments of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
Materials (Basel). 2021 Mar 30;14(7):1701. doi: 10.3390/ma14071701.
Effect of the residual stress on the recovery and recrystallization behaviors of the cold-rolled AA3003 aluminum alloy was investigated. The evolution of deformed microstructure and dislocation density characterized by TEM and Synchrotron X-ray measurements found that the change in the ratio between low angle grain boundaries (LAGBs) and high angle grain boundaries (HAGBs) during annealing is varied depending on the initial dislocation density, where the value of HAGB/LAGBs ratio is amounted to be about 0.8 at maximum. The nucleation and growth rate of the recrystallized grains are strongly dependent on the net driving pressure associated with dislocation density increased by the amount of reduction. EBSD analysis revealed that the deformed zone composed of the fine equi-axed grains with large misorientation angles would be formed in the vicinity of the constituent particles, which is consistent with the region of the large residual stress and total displacement predicted by Eshelby inhomogeneity problem under cold rolling condition.
研究了残余应力对冷轧AA3003铝合金回复和再结晶行为的影响。通过透射电子显微镜（TEM）和同步辐射X射线测量对变形微观结构和位错密度的演变进行表征，发现退火过程中低角度晶界（LAGBs）与高角度晶界（HAGBs）比例的变化取决于初始位错密度，其中HAGB/LAGBs比例的值最大约为0.8。再结晶晶粒的形核和生长速率强烈依赖于与因压下量增加而导致的位错密度相关的净驱动力压力。电子背散射衍射（EBSD）分析表明，在组成颗粒附近会形成由具有大取向差角的细小等轴晶粒组成的变形区，这与埃舍尔比不均匀性问题预测的在冷轧条件下大残余应力和总位移区域一致。
