Grain boundary structures in the commercial purity aluminum (1100Al) highly deformed
by the accumulative roll bonding (ARB) process was observed by using conventional transmission
electron microscopy (CTEM) and high resolution transmission electron microscopy (HRTEM). In
the low angle grain boundary with a tilt angle (2θ) of 2.1o consisted of the periodic dislocations
array, the interval of those dislocations could be explained by the dislocation model for grain
boundary. However, the dense dislocation region locally existed at the vicinity of the low angle
boundary. On the other hand, we also observed the high angle grain boundary of which the common
axis and 2θ was <110> and 125.9o, respectively. In this grain boundary, we could describe the
boundary configuration in terms of the combination of the kite-shaped structure unit characterized
by Σ11 coincidence boundary with the 2θ of 129.52o around <110> and the additional dislocations
to compensate the difference of the actual and geometrically coincided one.
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