partial dislocation
partial dislocation
The magnitude of Burgers vector b of a (perfect) dislocation is defined as the distance from a lattice point to the nearest lattice point. There may exist a meta-stable position for an atom given by a vector ｂ1 whose magnitude is smaller than b. The Burgers vector of the perfect dislocation can split to b = ｂ1+ｂ2. The defects having vectors ｂ1 and ｂ2 are called "partial dislocation." Since the dislocation energy is proportional to the square of the Burgers vector, the splitting (extension) of the perfect dislocation is possible. However, a stacking fault is introduced between two partial dislocations. The energy of the stacking fault determines whether or not the extended dislocation occurs and the width of the stacking fault. When the splitting distance of the two partials is short, the use of the weak-beam method is effective for determining this splitting.
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