Origin of strain hardening in monolithic metallic glasses
X. Yuan, Daniel Şopu, J. Eckert
Abstract
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.
Topics & Concepts
Materials scienceBrittlenessDuctility (Earth science)Strain hardening exponentHardening (computing)Composite materialAmorphous metalResidual stressCompressive strengthMetalShear (geology)PlasticityMetallurgyCreepAlloyLayer (electronics)Metallic Glasses and Amorphous AlloysGlass properties and applicationsElectromagnetic wave absorption materials