Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 13: Liquid and Amorphous Metals III: Mechanical properties

MM 13.4: Vortrag

Montag, 7. März 2016, 16:45–17:00, H52

Size effects in the deformation behavior of metallic nanoglass pillars — •Omar Adjaoud and Karsten Albe — Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Materialmodellierung, Jovanka-Bontschits-Str. 2, D-64287 Darmstadt, Germany

Metallic nanoglassses (NGs) are amorphous materials with an inhomogeneous microstructure which consists of glassy grains connected by glass-glass interfaces. The metallic NGs can be produced by consolidating nanometer-sized glassy spheres which are prepared by inert-gas condensation. Glass-glass interfaces of metallic NGs are characterized by an excess free volume and a lack of short range order. This characteristics of the interfaces prevent the shear strain localization during the deformation of the metallic NGs, which leads to an enhanced plasticity in metallic NGs as compared to the bulk metallic glasses of the same chemical composition. In this contribution, we present the results of MD simulations on size effects in the deformation behavior of Cu₆₄Zr₃₆ and Pd₈₀Si₂₀ nanoglass pillars by varying systematically the diameter of the pillars from 4.5 nm to 54 nm. The results reveal that the pillars deform homogeneously due to their inhomogeneous microstructure. In contrast metallic glass pillars, with the same chemical composition, fail along a single shear band. Consequently, we assume that the deformation behavior of metallic glass pillars can be controlled by changing their microstructure rather than their size.