Regensburg 2022 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 30: Liquid and Amorphous Metals
MM 30.5: Talk
Thursday, September 8, 2022, 11:15–11:30, H46
Enhancing ductility and strain hardening by modulating residual stresses in metallic glasses — •Xudong Yuan1, Daniel Şopu1,2, and Jürgen Eckert1,3 — 1Erich Schmid Institute of Materials Science, Leoben, Austria — 2Technische Universität Darmstadt, Darmstadt, Germany — 3Montanuniversität Leoben, Leoben, Austria
The correlation between the deformation behavior and the residual stress modulation in metallic glasses (MGs) is investigated using molecular dynamics simulations. Particularly, the influence of residual compressive stress and stress heterogeneity on the tensile deformation behavior of amorphous Cu64Zr36 alloys is investigated. Strain hardening together with enhanced tensile ductility in monolithic MGs can be attained by only modulating the internal stress without changing their local structure. The stress heterogeneity changes the shear band dynamics leading to the formation and interaction of multiple shear bands, which consequently enhances the macroscopic ductility. Additionally, the residual compressive stress offsets the external tensile stress, which delays shear band formation and enables strain hardening in uniaxial tensile tests.