Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Structure and deformation III

MM 39.1: Vortrag

Mittwoch, 22. März 2017, 10:15–10:30, IFW B

Glass formation by severe plastic deformation of crystalline Cu/Zr nano-layers — •Suzhi Li1, Lars Pastewka2,3, and Peter Gumbsch2,31Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 3Fraunhofer Institute for Mechanics of Materials IWM, 79108 Freiburg, Germany

The deformation of crystalline Cu/Zr nano-layers under severe shearing was studied by using molecular dynamics simulations. The whole process can be divided into two distinct stages. The early stage of plasticity is governed by dislocations. The dislocation-interface interaction can induce the interface roughening and slow mechanical mixing around boundaries. As strain is further applied, dislocation activities become less active. Under the large strain, domains are further refined and finally the interfaces are attached locally, where solid-state crystal-to-amorphous transition occurs. The deformation mode then transforms from dislocation plasticity to amorphization. The following deformation is fully localized in the glass transition zone where a strong atomic mixing takes place. The whole crystal-to-amorphous transition process can be characterized by certain Voronoi cells, such as Cu-centered <0 0 12 0>. In addition, the amorphization in thinner layers can be achieved at smaller shear strain. Our work enriches the understanding of amorphization and mechanical alloying in heavily deformation multicomponent systems.

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