Effect of Local Connectivity on Tensile Properties of CuZr Metallic Glasses Under Molecular Dynamics Simulations
Interpenetrating connection of icosahedral network(ICOIN)is a medium-range ordered(MRO)structure formed by connecting icosahedra.The evolution of MRO structures in metallic glasses(MG)under tensile deformation was studied via molecular dynamics simulations.The results indicated that ICOIN of the sample broke due to the tension,a few of them became disconnected and turned into isolated icosahedral clusters or transformed into other types of clusters.A smaller quantity fraction of connectivity at yielding and higher mises stresses could be a good match for the lower strength and good plasticity of the sample with low Cu content.In addition,in the sample with high Cu content,the icosahedra with low connectivity were more inclined to transform to high connectivity,causing the sample to remain higher connectivity after deformation and exhibiting high yield strength and low plasticity.
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