Atomistic Simulation of Superdislocation Dissociation in Ni3A1

  • M. H. Yoo
  • M. S. Daw
  • M. I. Baskes


The source of the anomalous temperature dependence (positive) of yield and flow strength in Ni3Al is believed to be the intrinsic lattice resistance to the motion of screw superdislocations. According to the cross-slip pinning (CSP) model,1,2 active dislocations of the (111)[101] primary slip system would acquire cross-slipped segments in the form of a sessile configuration on the (010) plane.3 These segments are statistically distributed along the leading superpartial dislocation and act as the pinning points on it. In a thermally activated process of double-kink formation, the number density of the pinning points is found to increase with increasing temperature because of two anisotropy factors, the anisotropy of antiphase boundary (APB) energy4 and the elastic shear anisotropy.5


Embed Atom Method Superlattice Intrinsic Stack Fault Superpartial Dislocation Complex Stack Fault Elastic Center 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • M. H. Yoo
    • 1
  • M. S. Daw
    • 2
  • M. I. Baskes
    • 2
  1. 1.Metals and Ceramics DivisionOak Ridge National LaboratoryOak RidgeUSA
  2. 2.Theoretical DivisionSandia National LaboratoriesLivermoreUSA

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