Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 58: Liquid and Amorphous Metals
MM 58.3: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, TC 010
Effect of elemental segregation on mechanical properties of metallic nanoglasses — •Sree Harsha Nandam1, Ruth Schwaiger2, Di Wang1, Reda Chellali1, Yulia Ivanisenko1, and Horst Hahn1 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — 2Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Metallic nanoglasses represent a new class of non-crystalline solids with excess free volume at the interfaces. Because such interfaces can act as nucleating sites for shear during plastic deformation, nanoglasses have enhanced plasticity compared to a conventional metallic glass. In this paper, the effect of elemental segregation at the interfaces on mechanical properties of Pd-Si and Cu-Zr binary metallic nanoglasses synthesized by inert gas condensation is studied. The amorphous nature and nanosize of the particles is confirmed by X-ray diffraction and transmission electron microscopy. Elemental segregation in nanoscale is observed in Cu-Zr system while no such segregation is found in Pd-Si nanoglasses by atom probe tomography. Deformation behavior is studied by nanoindentation and micropillar tests. Homogeneous deformation is observed in Cu-Zr metallic nanoglasses whereas inhomogeneous deformation is observed in Pd-Si system. The effect of elemental segregation and the free volume in the metallic nanoglasses on their deformation behavior will be discussed in the present paper.