The movement or dissociation of dislocations is signifi cantly important for better understanding the plastic deformation mechanisms and mechanical properties of metals.It is commonly believed that a dislocation<11...The movement or dissociation of dislocations is signifi cantly important for better understanding the plastic deformation mechanisms and mechanical properties of metals.It is commonly believed that a dislocation<110>/2 in Au is easy to dissociate into a pair of Shockley partial dislocations<112>/6 due to low stacking fault energy(SFE).Contrary to this prevailing perception,the present atomistic modeling demonstrates that this reaction could be completely suppressed when dislocations<110>/2 are grouped into tilt walls,consistent with our experimental observations.Such phenomenon is actually the extreme case accompanying with the variation of Burgers vectors of partials with tilt angle,as revealed by a series of simulations,from which it is clearly seen that the Burgers vectors of partials deviate considerably from that of Shockley partials,enormously depending on the tilt angle.Our fi ndings could facilitate a better understanding on many phenomena and properties of face-centered cubic metals(FCC).展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52071316,51771206 and 51571198)K.C.Wong Education Foundation(No.GJTD-2020-09)。
文摘The movement or dissociation of dislocations is signifi cantly important for better understanding the plastic deformation mechanisms and mechanical properties of metals.It is commonly believed that a dislocation<110>/2 in Au is easy to dissociate into a pair of Shockley partial dislocations<112>/6 due to low stacking fault energy(SFE).Contrary to this prevailing perception,the present atomistic modeling demonstrates that this reaction could be completely suppressed when dislocations<110>/2 are grouped into tilt walls,consistent with our experimental observations.Such phenomenon is actually the extreme case accompanying with the variation of Burgers vectors of partials with tilt angle,as revealed by a series of simulations,from which it is clearly seen that the Burgers vectors of partials deviate considerably from that of Shockley partials,enormously depending on the tilt angle.Our fi ndings could facilitate a better understanding on many phenomena and properties of face-centered cubic metals(FCC).
