Micro-scaled plastic yielding and shear-banding dynamics in metallic glasses

Authors：Han, D. X.; Wang, G.^*; Wang, Q.; Feng, R.; Ma, X. D.; Chan, K. C.; Liu, C. T.

Source：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2023, 152: 237-246.

DOI：10.1016/j.jmst.2022.12.050

• Metallic glasses
• Shear-banding dynamics
• Micro-compression
• Plastic deformation

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.

• Institution
  上海大学