Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Uniaxial tensile test on an amorphous solid with embedded quasicrystallites: a molecular dynamics study

Y.F. Shi, M.L. Falk*
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA

  Full Text
Molecular dynamics simulations of uniaxial tension in a two-dimensional model of a metallic glass exhibit shear localization. The structure of this model system is characterized based on the short range ordering, arising from the underlining quasi-crystalline packing order. Atoms with quasi-crystalline order cluster together to form quasi-crystallites, which embed inside the amorphous matrix. Regions of the sample with quasi-crystalline order tend to have more resistance to deformation, while regions with pure amorphous structure tend to deform more easily. The existence of quasi-crystallites inside the glass, and their evolution during deformation, appears to induce the instability of shear banding in this system.

Keywords:  Molecular dynamics; Amorphous; Quasi-crystal; Shear localization; Shear bands; Metallic glasses; Uniaxial tension

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