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The first principles discrete variational method is employed to study the effect of some light impurities, such as B, C, N and O, on the edge dislocation motion in bcc iron at T=0 K. The results of the simulation to the dislocation motion show that a dislocation line, when crossing an atom on the slip plane, must surmount an energy barrier, and that the impurity atoms trapped in the dislocation core...
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