Abstract

Some special dislocation “networks” in annealed α-Ti single crystals are observed by transmission electron spectroscopy. The results indicate that there are no nodes, but double lines appear in one direction of the “networks”. An analysis of the special dislocation configuration shows that the formation mechanism of this kind of network is different from the traditional case in which the networks are formed by reaction of two groups of dislocations lying on the same plane. However, the so-called special networks are formed by interaction between two sets of dislocations lying on two parallel non-basal slip planes. If the spacing of the slip planes is less than one quarter of the dislocation spacing in the dislocation array, the two sets of dislocations lying on two parallel non-basal planes will change their shape and become zigzag shaped. Furthermore, the regular low energy configuration is formed in the shape of a hexagonal network. When this three-dimensional low energy configuration is projected on the view plane, the so-called networks can be observed. Possible types of such low energy networks are also predicted with the help of interaction energy analysis.

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