MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Stability of {4 4 11} ⟨11 11 8⟩ Orientation in a {123} ⟨634⟩ Aluminum Single Crystal Processed by Accumulative Roll Bonding
Keizo KashiharaYoshikazu KomiDaisuke TeradaNobuhiro Tsuji
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2014 Volume 55 Issue 11 Pages 1656-1661

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Abstract

A pure aluminum single crystal with a (213) [36\bar{4}] 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 \bar{8}]. Two different kinds of crystal rotations were observed to form (4 4 11) [11 11 \bar{8}]; one was the rotation from (213) [36\bar{4}] to (4 4 11) [11 11 \bar{8}] in the center layer, and the other was the rotation from (116) [33\bar{1}] to (4 4 11) [11 11 \bar{8}] 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 \bar{8}] orientation after many ARB cycles. In the present study using the (213) [36\bar{4}] single crystal, the (\bar{4} \bar{4} 11) [11 11 8] orientation was barely found even after an equivalent strain of 7.18. The lack of (\bar{4} \bar{4} 11) [11 11 8] orientation in the center layer is due to the absence of the (001) [110] orientation in the lower surface layer.

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© 2014 The Japan Institute of Light Metals
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