Stability of {4411} < 11 11 8 > Orientation in a {123} < 634 > Aluminum Single Crystal Processed by Accumulative Roll Bonding

作者：Kashihara Keizo^*; Komi Yoshikazu; Terada Daisuke; Tsuji Nobuhiro

来源：Materials Transactions, 2014, 55(11): 1656-1661.

DOI：10.2320/matertrans.L-M2014833

• accumulative roll bonding
• Dillamore orientation
• single crystal
• aluminum
• texture

A pure aluminum single crystal with a (213) [36 (4) over bar] orientation was deformed by accumulative roll bonding (ARB) to an equivalent strain of 7.18 under lubricated conditions. The main orientation of the texture in the center layer was (4 4 11) [11 11 (8) over bar]. Two different kinds of crystal rotations were observed to form (4 4 11) [11 11 (8) over bar]; one was the rotation from (213) [36 (8) over bar] to (4 4 11) [11 11 (8) over bar] in the center layer, and the other was the rotation from (116) [33 (1) over bar] to (4 4 11) [11 11 (8) over bar] when the area changed its position from the surface to the center. The latter rotation is followed by the cyclic ratcheting mechanism proposed by Heason et al. These crystal rotations lead to the stable existence of the (4 4 11) [11 11 (8) over bar] orientation after many ARB cycles. In the present study using the (213) [36 (4) over bar] single crystal, the ((4) over bar (4) over bar 11) [11 11 8] orientation was barely found even after an equivalent strain of 7.18. The lack of ((4) over bar (4) over bar 11) [11 11 8] orientation in the center layer is due to the absence of the (001) [110] orientation in the lower surface layer.

• 出版日期2014