Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 40: Liquid and Amorphous Metals
MM 40.3: Vortrag
Donnerstag, 4. April 2019, 15:30–15:45, H46
Characterization of CuZr-based bulk metallic glasses rejuvenated by severe plastic deformation — Christian Ebner1, Benjamin Escher2, Christoph Gammer3, Jürgen Eckert3, Simon Pauly2, and •Christian Rentenberger1 — 1University of Vienna, Physics of Nanostructured Materials, Vienna, Austria — 2Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, Dresden, Germany — 3Austrian Academy of Sciences, Erich Schmid Institute of Materials Science, Leoben, Austria
Bulk metallic glasses (BMGs) are materials composed of metal components but lack long-range order. The latter renders BMGs unique in their mechanical properties. Nevertheless, they exhibit also a low ductility caused by a very localized plastic deformation. Therefore, it is one of the challenging aims to find ways and processes for improvements. In this work we show that severe plastic deformation of BMGs facilitates a rejuvenation of the disordered atomic structure that was characterized by various methods including Synchrotron X-ray diffraction, nanoindentation, differential scanning calorimetry, atomic force and transmission electron microscopy. By a unique and unprecedented mapping of structural and mechanical quantities on micrometer scale a clear correlation both between elastic and plastic softening and between softening and mean atomic volume can be revealed [1]. Finally, based on nanoindentation curves it is concluded that structural rejuvenation promotes a more homogeneous like deformation.
[1] C. Ebner et al., Acta Mater 160 (2018) 147.
Support by the Austrian Science Fund FWF: I1309 is acknowledged.