  In Laves phases, synchroshear is the dominant basal slip mechanism. It is
accomplished by the glide of synchro-Shockley dislocations. However, the
atomic-scale mechanisms of motion of such zonal dislocations are still not well
understood. In this work, using atomistic simulations, two 30\textdegree{}
synchro-Shockley dislocations with different Burgers vectors and core
structures and energies are identified. We demonstrate that nucleation and
propagation of kink pairs is the energetically favorable mechanism for the
motion of the synchro-Shockley dislocation (partial I). Vacancy hopping and
interstitial shuffling are identified as two key mechanisms related to kink
propagation and we investigated how vacancies and antisite defects assist kink
nucleation and propagation, which is crucial for kink mobility. Additionally,
we identified a mechanism of non-sequential atomic shuffling for the motion of
the synchro-Shockley dislocation (partial II). These findings provide insights
into the dependency on temperature and chemical composition of plastic
deformation induced by zonal dislocations in Laves phases and the many related
topologically close-packed phases.
