in which two distinct regions between Aand B,B and C can be
distinguished,namely dislocation free zone(DFZ)and inverse pileup dislocation group(Dp),respectively.The range of Dp is much
larger than that of DFZ,and the dislocation density in Dp decreases
with the distance to crack tip.Furthermore,strong interactions can
also be observed bet ween emitted dislocation sandTdispersoids
(siteD)as well as the intrinsic dislocations(such as helical disloc at ionatsiteE),which play important roles in hindering the emission and migration of dislocations from the crack tip