论文期刊

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




作者: J.C. Zhang, W.X. Zhang*
发表/完成日期: 2019-02-21
期刊名称: Journal of Applied Physics
期卷:
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论文简介
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.
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