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MM: Fachverband Metall- und Materialphysik
MM 13: Liquid and Amorphous Metals III: Mechanical properties
MM 13.5: Talk
Monday, March 7, 2016, 17:00–17:15, H52
Analysis of the impact of nanocrystalline precipitates on the deformation behavior of a ZrCu based metallic glass — •Marius Gerlitz1, Tobias Brink2, Martin Peterlechner1, Harald Rösner1, Karsten Albe2, and Gerhard Wilde1 — 1Institut für Materialphysik, WWU Münster, Germany — 2Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany
Due to the absence of dislocations in amorphous materials, plastic deformation of metallic glasses is carried by localized shear bands. In this work, the influence of nanocrystalline precipitates on the formation of shear bands is surveyed. To control the size and distribution of nanocrystallites within the amorphous phase, a crystallization study of the time and temperature dependence is carried out using differential scanning calorimetry (DSC). Structural analysis of partial crystallized samples is accomplished by transmission electron microscopy (TEM). Subsequently to the annealing procedure, the deformation of the material is enforced via cold rolling using a two-high rolling mill. By this means shear bands are induced inside the material. TEM analysis of the annealed and deformed metallic glass reveals the interaction between shear bands and nanocrystallites. Experimental results are compared to results of molecular dynamics simulations concerning different types of shear band particle interactions. The financial support of the DFG is gratefully acknowledged.