Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield strength.In a micro-scale,the shear-banding behavior must be affected by many factors ...Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield strength.In a micro-scale,the shear-banding behavior must be affected by many factors from the test machine and the substrate.Therefore,in this study,comprehensively considering a machine compliance,a geometry imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate system,we developed a plastic-strength model at a micrometer scale in this study,which is evidenced by the microscale compressive properties of 18 kinds of metallic glasses.The the-oretical model provides a guidance for the elastic limits and shear-banding dynamics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Nos.51925103,51801027)the program 173(No.2020-JCIQ-ZD-186-01)+1 种基金China Postdoctoral Science Foundation(No.2022M713334)the Research Grants Council of the Hong Kong Special Administrative Region,China(No.PolyU 15222017).
文摘Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield strength.In a micro-scale,the shear-banding behavior must be affected by many factors from the test machine and the substrate.Therefore,in this study,comprehensively considering a machine compliance,a geometry imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate system,we developed a plastic-strength model at a micrometer scale in this study,which is evidenced by the microscale compressive properties of 18 kinds of metallic glasses.The the-oretical model provides a guidance for the elastic limits and shear-banding dynamics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.
