Spontaneous athermal cross-slip nucleation at screw dislocation intersections in FCC metals and L12intermetallics investigated via atomistic simulations

2013 ◽  
Vol 93 (22) ◽  
pp. 3012-3028 ◽  
Author(s):  
S.I. Rao ◽  
D.M. Dimiduk ◽  
J.A. El-Awady ◽  
T.A. Parthasarathy ◽  
M.D. Uchic ◽  
...  
Keyword(s):  
Screw Dislocation ◽  
Cross Slip ◽  
Atomistic Simulations ◽  
Fcc Metals

Screw dislocation cross slip at cross-slip plane jogs and screw dipole annihilation in FCC Cu and Ni investigated via atomistic simulations

2015 ◽  
Vol 101 ◽  
pp. 10-15 ◽  
Author(s):  
S.I. Rao ◽  
D.M. Dimiduk ◽  
J.A. El-Awady ◽  
T.A. Parthasarathy ◽  
M.D. Uchic ◽  
...  
Keyword(s):  
Screw Dislocation ◽  
Slip Plane ◽  
Cross Slip ◽  
Atomistic Simulations

Atomic Scale Simulation of Cross Slip and Screw Dislocation Dipole Annihilation

1998 ◽  
Vol 538 ◽  
Author(s):  
Torben Rasmussen
Keyword(s):  
Screw Dislocation ◽  
Energy Barrier ◽  
Minimum Energy ◽  
Experimental Studies ◽  
Cross Slip ◽  
Atomic Scale ◽  
Atomistic Simulations ◽  
Minimum Energy Path ◽  
Dislocation Dipole ◽  
Single Screw

AbstractAtomistic simulations are used to study cross slip of a single screw dislocation as well as screw dislocation dipole annihilation in Cu. A configuration space path techniquex is applied to determine, without presumptions about the saddle point, the minimum energy path of transition for cross slip. The cross slip process is that proposed by Friedel and Escaig, and the energy of the in-plane constriction initiating cross slip is determined. A minimum stable dipole height much smaller than previously inferred from experimental studies is found. Relaxed screw dislocation dipoles adopt a skew configuration due to the anisotropy of Cu. The path technique is applied to investigate annihilation of stable screw dislocation dipoles, and the energy barrier for annihilation as a function of dipole height is determined for both homogeneous and heterogeneous cross slip leading to the annihilation. The results might be used as quantitative input into meso-/macro-scopical modelling approaches which rely on parameters deduced from either simulation or experiment.

Stochastic Dislocation Dynamics under Creep Conditions in Metals

2002 ◽  
Vol 731 ◽  
Author(s):  
Masato Hiratani ◽  
Hussein M. Zbib
Keyword(s):  
Thermal Fluctuation ◽  
Dislocation Motion ◽  
Cross Slip ◽  
Dislocation Dynamics ◽  
Atomistic Simulations ◽  
Thermal Processes ◽  
New Model ◽  
Slip Mechanism ◽  
Fcc Metals ◽  
Thermally Activated

AbstractA stochastic model is proposed to study dislocation dynamics in metallic single crystals. A Langevin type thermal fluctuation is taken into account for the model to maintain thermal equilibrium. This approach works as Brownian motion of segmental dislocations. Additionally, a new model for implementing the cross slip mechanism in FCC metals is developed based on results obtained by atomistic simulations. This new model is capable of simulating realistic thermal processes such as thermally activated dislocation motion during easy glide or cross slip during cold working of metals.

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