Interaction between mobile dislocations and perfect dislocation loops in Fe-Ni-Cr austenitic alloy systems

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  • PbPU - Peter the Great St.Petersburg Polytechnic University - Russia

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Abstract

The classical molecular dynamics method is employed to simulate the interaction of screw and edge dislocations with interstitial perfect dislocation loops (of 2 and 5 nm in diameter) in the austenitic model alloy Fe70Ni10Cr20 at temperatures of T = 300–900 K. Perfect loops can be created from Frank loops during the plastic deformation of irradiated austenitic steels applied in nuclear reactors. As a result, the dislocation-defect interaction mechanisms are established and classified. The loop absorption mechanisms, which are related to the formation of free channels capable of enhancing radiation-induced steel embrittlement, are revealed. The effectivenesses of loop absorption observed during their interaction with screw and edge dislocations, as well as unpinning stresses required for a dislocation to overcome the defect acting as an obstacle, are compared versus the material temperature, defect size, and interaction geometry.

Details

Original languageEnglish
Pages (from-to)290-299
JournalJournal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques
Volume9
Issue number2
DOIs
Publication statusPublished - 15 Apr 2015

Keywords

  • Absorption mechanisms, Austenitic alloys, Austenitic model alloys, Classical molecular dynamics, Dislocation defects, Interaction geometries, Material temperature, Dislocation loop

ID: 3751560