Journal
PHYSICAL REVIEW B
Volume 84, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.144108
Keywords
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Funding
- Department of Energy, National Nuclear Security Administration [DE-FC52-08NA28617]
- United States Department of Energy Office of Basic Energy Sciences [DE-FG02-07ER46398]
- Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
- Los Alamos National Laboratory Directed Research and Development (LDRD) projects [DR20110029, DR20090035]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46398] Funding Source: U.S. Department of Energy (DOE)
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We present simulations of the dissociation of perfect dislocations into extended partial dislocations in aluminum, palladium, and nickel using a phase field dislocation dynamics (PFDD) theory that incorporates the gamma surface. As expected from dislocation theory, the simulations show that increasing the intrinsic stacking fault energy, normalized by the product of the shear modulus and Burgers vector, decreases the equilibrium stacking fault width. Significantly, it is also found that increasing the unstable stacking fault energy has the same effect when the intrinsic stacking fault energy is held constant. Furthermore, our results show that the equilibrium configurations cannot be described only by the ratio between the intrinsic and unstable stacking fault energies as previously suggested but rather by their product.
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