Deformation twins on {111} planes in zirconium appear to form by means of a different mechanism from twins on the same planes in other hexagonal materials. An adequate explanation of the crystallographic features of the Zr twins cannot be given in terms of conventional twinning modes and it is suggested that a double twinning process is responsible for their formation. The most likely mechanism is shown to be twinning on {11 } followed by re-twinning on {11}.
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A. G. Crocker (1963) studied this question.
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