采用SEM-EBSD技术测试了室温和180 ℃条件下80%压下量轧制高纯铝样品的微取向分布. 结果表明: 平行于轧向的形变组织可分为取向分布集中和取向散布的带状组织. 前者取向主要聚集于β-取向线，其中Br-取向({011}＜211＞)的小角度(2°—5°)晶界面积率比S-({123}＜634＞和C-({112}＜111＞)取向的大10%—15%；随轧制温度从室温升至180 ℃，回复程度增强，中等角度(5°—15°)晶界面积率约升高10%. 用Bishop-Hill晶体塑性理论分析β-取向线组织的塑性变形储能差异表明，取向的Taylor因子M越小，5个独立活化滑移系的组合数越多，其变形储能就越小，小角度晶界比例亦越大.
The orientation imaging micrographs (OIMs) in high purity aluminum rolled to 80% under room temperature and 180 ℃ were investigated using the SEM-EBSD technique. It was found that the elongated bands parallel to the rolling direction (RD) have two morphologies-the orientation concentrated and the orientation scattered, the orientations of the former mainly rotated toward β-fibre, and the area fraction of the low angle (2°---5°) boundaries in the bands with the Br-({011}＜211＞) orientation was about 10%--15% larger than those of the S-({123}＜634＞) and C-({112}＜111＞) orientations. When the rolling temperature changed from the room temperature to 180 ℃, the area fraction of the middle angle (5°---15°) boundaries was increased by about 10% because of stronger recovery during rolling at 180 ℃. The energy difference of the boundary distributions for the orientations along the β-fibre has been analyzed in term of Bishop-Hill crystal plasticity theory. It is shown that the orientations with smaller values of Taylor factor M and larger combination numbers of 5 independent active systems correspond to less boundary energy and lower angle boundary during rolling.
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