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B2 alloys classified according to splitting of superlattice dislocations

Tuesday (27.09.2016)
15:15 - 15:30
Part of:

In the relatively simple ordered structure of B2 type, the dislocation core structure is controlled by the stacking-fault-like defects as antiphase boundaries. It will be shown, that three types of B2 alloys can be distinguished differing by the degeneracy of antiphase-boundary-like defects energies on the {110} plane: crystallographic, two- and four-fold degenerated antiphase boundary energies. Stacking fault-like defect energies are calculated by ab initio methods and dislocation interactions are treated in a mesoscopic model of anisotropic elasticity. The mechanical properties are directly influenced by the properties of dislocation and so various types of superlattice dislocations composed of several partial dislocations will be discussed and their impact on dislocation behaviour will be evaluated.

Dr. Vaclav Paidar
Academy of Sciences of the CR