摘要
Shear deformation can induce normal stress or hydrostatic stress in metallic glasses [Nature Mater. 2 （2003） 449, Intermetallics 14 （2006） 1033]. We perform the bulk deformation of three-dimensional Cu46Zr54 metallic glass （MG） and Cu single crystal model systems using molecular dynamics simulation. The results indicate that hydrostatic stress can incur shear stress in MG, but not in crystal. The resultant pronounced asymmetry between tension and compression originates from this inherent shear-dilatation coexistence in MG.
Shear deformation can induce normal stress or hydrostatic stress in metallic glasses [Nature Mater. 2 （2003） 449, Intermetallics 14 （2006） 1033]. We perform the bulk deformation of three-dimensional Cu46Zr54 metallic glass （MG） and Cu single crystal model systems using molecular dynamics simulation. The results indicate that hydrostatic stress can incur shear stress in MG, but not in crystal. The resultant pronounced asymmetry between tension and compression originates from this inherent shear-dilatation coexistence in MG.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10725211, 10721202 and 10872206, and the Key Project of Chinese Academy of Sciences under Grant Nos KJCX-SW-L08 and KJCX2-YW-M04.
