Unique tension-compression asymmetry of nanoporous metallic glasses induced by surface effects

• Date:2025-04-30
• Title of Paper:Unique tension-compression asymmetry of nanoporous metallic glasses induced by surface effects
• Journal:Journal of Applied Physics
• Summary:The mechanical properties of nanoporous (NP) metallic glasses (MGs) under uniaxial tension and compression are studied via
  molecular dynamics simulations in this work. The shrinking tendency within NP MGs, induced by the surface effects, results in
  the unique tension-compression asymmetry, i.e., the tensile yield strength is stronger than the compressive yield strength and
  the tensile yield strain is bigger than the compressive yield strain. This unique tension-compression asymmetry of NP MGs is
  contrary to that of the pore-free bulk MGs and the MGs with macroscopic pores. The strengthening phenomenon with the
  increase of the pore size is more remarkable for compression than tension due to the difference of elastic energy release during
  the deformation. Moreover, with the pore size decreasing, the deformation mechanism of NP MGs changes from catastrophic
  fracture with a single dominant shear band to homogeneous plastic deformation with multiple shear bands under both tensile
  loading and compressive loading. Our results are helpful in understanding the surface effects on NP materials and important for
  optimization design of NP materials.
• Co-author:J.C. Zhang, W.X. Zhang*
• Translation or Not:No
• Date of Publication:2019-02-21