Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 66: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses VI - mechanical properties

MM 66.5: Vortrag

Donnerstag, 23. März 2017, 17:00–17:15, IFW A

Transformation-mediated ductility in bulk metallic glass composites — •Daniel Sopu¹, Mihai Stoica¹, and Jürgen Eckert² — ¹IFW Dresden, Helmholtzstr. 20, 01069, Institut für Komplexe Materialien, Dresden, Germany — ²Erick Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria

We investigate the influence of various critical structural aspects such as crystallite phase, size and distribution on the deformation behavior of Cu64Zr36 bulk metallic glass composites. By using molecular dynamics simulations we provide an effective strategy to control the strain localization in these composites. We show that the shear band nucleation and localization is strongly influenced by the martensitic transformation of the B2 CuZr nanocrystallites. Moreover, the martensitic transformation perturbs the local atomic strain around the nanocrystals leading to broadening of the shear bands when approaching these nanocrystals. The width increase of a shear band reduces the elastic shear stress in the vicinity of the nanoparticles, and thereby impedes the further propagation and formation of critical shear bands. This unique deformation mechanism promote ductility and work hardening in bulk metallic glass composites.