Dislocation–interface interaction in nanoscale fcc metallic bilayers

Dislocation–interface interactions are investigated in a Ni–Cu bilayer using molecular mechanics simulations. Nanoindentation model is used to generate dislocations in the top Ni layer and study their propagation through coherent (1 1 1) fcc interface into Cu. Although dislocations do propagate thro...

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Bibliographic Details
Published inMechanics research communications Vol. 37; no. 3; pp. 315 - 319
Main Authors Shao, Shuai, Medyanik, Sergey N.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.2010
Subjects
Atomistic simulation
Dislocations
Interfaces
Metallic composites
Nanoindentation
Nanomaterials
Interfaces
Atomistic simulation
Nanomaterials
Metallic composites
Nanoindentation
Dislocations
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Summary:Dislocation–interface interactions are investigated in a Ni–Cu bilayer using molecular mechanics simulations. Nanoindentation model is used to generate dislocations in the top Ni layer and study their propagation through coherent (1 1 1) fcc interface into Cu. Although dislocations do propagate through, the interface acts as a strong barrier to gliding dislocations and contributes considerably to the overall strain hardening of the nanolayered material. Mechanisms of dislocation–interface interactions are analyzed. In particular, spreading of a dissociated dislocation core at the interface and interfacial stacking fault formation are investigated along with their effect on the material strengthening.
ISSN:0093-6413
1873-3972
DOI:10.1016/j.mechrescom.2010.03.007