Origin of strain hardening in monolithic metallic glasses

To overcome the brittleness of metallic glasses (MGs), their structure, chemistry, or loading conditions are usually controlled. Here, the local stress state in MGs was modulated without affecting their structure. The elastically designed MG heterostructures provide enhanced ductility together with strain hardening during loading. The stress heterogeneity leads to shear band multiplication that consequently enhances the macroscopic ductility of MGs. In addition, the residual compressive stress significantly increases the strength of the glass and is responsible for the observed strain hardening.

Automated summary

The local stress state in metallic glasses can be modulated without affecting their structure, leading to enhanced ductility and strain hardening during loading. The stress heterogeneity in metallic glasses results in shear band multiplication, ultimately enhancing their macroscopic ductility. Additionally, residual compressive stress significantly increases the strength of the glass and contributes to observed strain hardening.