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MM: Fachverband Metall- und Materialphysik
MM 30: Liquid and Amorphous Metals
MM 30.1: Vortrag
Donnerstag, 8. September 2022, 10:15–10:30, H46
Controlling the degree of rejuvenation and strain-hardening in metallic glasses — •Daniel Şopu1,2, Xudong Yuan1, and Jürgen Eckert1,3 — 1Erich Schmid Institute of Materials Science, Leoben, Austria — 2Technische Universität Darmstadt, Germany — 3Montanuniversität Leoben, Austria
The correlation between the degree of rejuvenation and strain-hardening in metallic glasses (MGs) is investigated using molecular dynamics simulations. By randomly removing atoms from the glass matrix, free volume is homogeneously generated and glassy states with different degrees of rejuvenation are designed and further mechanically tested. The highest rejuvenated state is defined by the dynamic balance between free volume generation and annihilation. The highest degree of rejuvenation correlates to the flow strain of the materials and the structure is similar to that found in shear bands. The free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Loading-unloading cycling tensile tests are simulated and the atomic-scale mechanism of strain-hardening in the highly rejuvenated MGs is highlighted.