Metallurgical and Materials Transactions B

, Volume 33, Issue 2, pp 285–296 | Cite as

Localized deformation and hardening in irradiated metals: Three-dimensional discrete dislocation dynamics simulations

  • Tariq A. Khraishi
  • Hussein M. Zbib
  • Tomas Diaz de la Rubia
  • Max Victoria


When irradiated, metals undergo significant internal damage accumulation and degradation of mechanical properties. Damage takes the form of a high number density of nanosize defect clusters (stacking-fault tetrahedrons (SFTs) or interstitial loops). The alteration of mechanical properties is manifested in a hardening behavior and localized plastic deformation in defect-free channels. This work uses discrete dislocation dynamics (DD) to capture these effects. It sets the framework for the elastic interaction between gliding dislocations and defect clusters and details a scheme for loop unfaulting and absorption into dislocations. Here, it is shown that SFTs represents weaker pinning points for dislocation motion than parent dislocation loops. It is also shown that appreciable yield drop can be attributed to high density of defects decorating the dislocations. Strong obstacles cause dislocations in Cu to continually double cross slip causing the formation of defect-free channels. Finally, the correlation between yield stress increase and defect number density is in excellent agreement with the experiment.


Material Transaction Burger Vector Dislocation Loop Defect Cluster Cross Slip 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2002

Authors and Affiliations

  • Tariq A. Khraishi
    • 1
  • Hussein M. Zbib
    • 2
  • Tomas Diaz de la Rubia
    • 3
    • 4
  • Max Victoria
    • 5
  1. 1.the Mechanical Engineering DepartmentUniversity of New MexicoAlbuquerque
  2. 2.the School of Mechanical and Materials EngineeringWashington State UniversityPullman
  3. 3.Chemistry and Materials Science DirectorateUSA
  4. 4.Lawrence Livermore National LaboratoryLivermore
  5. 5.the Ecole Polytechnique de LausanneCRPP-Fusion Technology MaterialsVilligen PSISwitzerland

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