Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Postersession I
MM 17.17: Poster
Montag, 16. März 2015, 18:00–20:00, Poster E
Processing and characterization of a deformed ZrCu metallic glass with tunable content of nanocrystallites — •Marius Gerlitz, Jonas Bünz, Martin Peterlechner, and Gerhard Wilde — Westfälische Wilhelms-Universität, Münster, Deutschland
The deformation mechanisms of metallic glasses are in focus of current research. In the present work, a ZrCu-based glass with a nominal composition of Zr53.8Cu31.6Ag7.0Al7.6 (at. %) was processed by arc melting and subsequent melt-spinning. Upon heating, controlled growth of crystallites occurs at well-chosen temperatures and times. A study is carried out by systematically varying the annealing parameters of the as-produced amorphous sample using differential scanning calorimetry (DSC). Determination of the crystallization kinetics leads to the ability to tailor the volume fraction of nanocrystallites embedded in the amorphous matrix. The obtained nanocrystallites are observed by transmission electron microscopy (TEM). Subsequently to an annealing treatment to obtain partial crystallization, the material is deformed by cold rolling using a two-high rolling mill. This method leads to the generation of shear bands. TEM analysis was carried out to analyze shear bands and their interaction with nanocrystallites. The results are discussed with respect of the impact of nanocrystalline precipitates on the propagation of shear bands in a metallic glass.