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| MICROSTRUCTURES AND BOUNDARY DISTRIBUTIONS IN Al POLYCRYSTALS ROLLED AT DIFFERENT TEMPERATURES |
| ZHANG Xinming; DENG Yunlai; LIU Ying; TANG Jianguo; ZHOU Zhuoping |
| College of Materials Science and Engineering; Central South University; Changsha 410083 |
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Cite this article:
ZHANG Xinming; DENG Yunlai; LIU Ying; TANG Jianguo; ZHOU Zhuoping. MICROSTRUCTURES AND BOUNDARY DISTRIBUTIONS IN Al POLYCRYSTALS ROLLED AT DIFFERENT TEMPERATURES. Acta Metall Sin, 2005, 41(9): 947-952 .
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Abstract 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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Received: 18 January 2005
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