Molecular Dynamics Simulation Elucidating the Deformation Mechanism of Single Crystal Cr-Co-Ni Alloys with Compositional Dependence
In recent years,Co-Cr-Ni medium-entropy alloys have attracted extensive attention in the field of materials research owing to its outstanding properties.However,with the change of chemical composition in single crystal Co-Cr-Ni medium-entropy alloys,the influence of internal microstructure on mechanical properties such as plasticity and hardness still needs detailed exploration.This work,by utilizing molecular dynamics simulation,investigated in depth a variety of single crystal Co-Cr-Ni medium-entropy alloys with different compositions,including the stoichiometric CoCrNi,and the non-stoichiometric Co10(CrNi)90,Cr10(CoNi)90,and Ni10(CoCr)90.The results revealed the significant difference of mechanical properties of materials with different compositions,including yield stress,Young's modulus,and flow stress.Furthermore,the Lomer-Cottrell lock structure,stacking fault tetrahedron,and microstructure evolution,as well as the strengthening effect of these factors on the material,were also analyzed.
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