Structural skeleton of preferentially interpenetrated clusters and correlation with shear localization in Mg–Cu–Ni ternary metallic glasses

摘要: Inherent hierarchical structure and its effect on shear localization were clarified for ternary Mg–Cu–Ni metallic glasses via molecular dynamics studies based a newly constructed n-body potential the system. Assisted by proposed index to detect medium-range correlation heterogeneity, it was found that Cu/Ni-centered icosahedra specific Mg-centered clusters exhibit strong preference interconnect, leading formation, over an extended scale, of percolated network serves as structural skeleton in glassy matrix. In constituting network, mainly integrate interpenetrating mode, while noninterpenetrating linkages provide additional reinforcements, jointly consolidating energetic stability skeleton. Furthermore, monitoring evolution upon compressive deformation, revealed gradual collapse is intimately correlated mechanical response acts signature initiation propagation bands.