Journal
MOLECULAR SIMULATION
Volume 45, Issue 7, Pages 572-584Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927022.2019.1566606
Keywords
High entropy alloy; molecular dynamics simulation; dislocation; stacking fault; dislocation loop
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In this present study, deformation behaviour of Mo20W20Co20Ta20Zr20 high entropy alloy (HEA) coated single crystal (SC) nickel (Ni) subjected to nanoindentation test have been investigated to study the mechanical properties and underlying mechanism during nanoindentation test using molecular dynamics (MD) simulation with embedded atom method (EAM) potential. Centro-Symmetry Parameter (CSP) Analysis and Radial Distribution Function (RDF) plots are obtained to get insight of structural evolution during nanoindentation and thereby determine the underlying physics of deformation. During nanoindention test Stacking faults (SFs) formation, dislocation generation, dislocation loops, Lomer-Cottrell (LC) lock and Hirth lock formation due to dislocation-dislocation interaction are observed. At higher indentation depth, formation of dislocation loops is augmented, which indicates nanoindentation deformation is found to be Stacking Fault dominated deformation. The accumulation and relaxation of shear stress near indenter tip at the time of deformation process under nanoindentation test causes the variation of dislocation density, strain hardening, and plastic deformation, which is influenced by the formation of dislocation barriers (LC and Hirth locks) and dislocation loops (shear and prismatic loops).
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