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A
twist boundary causes a pure rotation between two crystals of the same
structure. The boundary is composed of a regular two-dimensional array
of screw dislocations of the same sign in the boundary plane. If all the
dislocations have a Burgers vector, b, and their spacing in the array is
D, the twist angle is q =
b/D.
The
photograph shows the regular hexagonal array of screw dislocations in a
twist boundary of an fcc aluminum sample.
From:
Thomas, "Transmission Electronmicroscopy of Metals," Wiley (1962) |
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