Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 13: Liquid and Amorphous Metals III: Mechanical properties
MM 13.3: Vortrag
Montag, 7. März 2016, 16:15–16:30, H52
Synthesis and Mechanical properties of Cu-Zr metallic Nanoglasses — •Sree Harsha Nandam1, Ruth Schwaiger2, Julia Ivanisenko1, Xiaoke Mu1, and Horst Hahn1,3 — 1Institute for Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany. — 2Institute for Applied Materials, Karlsruhe Institute of Technology, D-76344, Eggenstein-Leopoldshafen, Germany. — 3KIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technische Universität Darmstadt (TUD), Jovanka-Bontschits-Str. 2, D-64287 Darmstadt, Germany.
Bulk Cu50Zr50 metallic nanoglass (NG) specimens were synthesized using a modified Inert Gas Condensation method fitted with magnetron sputtering instead of thermal evaporation of the starting alloy. As-sputtered powder had a particle size of about 5-8 nm as observed in a transmission electron microscope. X-ray diffraction of the synthesized pellet confirmed its amorphous nature and energy dispersive spectroscopy showed the equiatomic Cu50Zr50 alloy. Differential scanning calorimetry revealed a crystallization temperature of the NG specimen of around 475°C. Vickers microhardness and compression tests of NG Cu50Zr50 specimens were performed. Similar tests were also carried out on metallic glass ribbons of a similar composition. In order to compare elastic modulus of the nanoglass samples and of the melt spun ribbons, nanoindentation tests were performed. Possible reasons for the differences in the mechanical behavior of the melt spun ribbons and nanoglass samples will be discussed in the present paper.