Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 6: Liquid and Amorphous Metals II: Shear bands
MM 6.3: Vortrag
Montag, 7. März 2016, 12:00–12:15, H52
Physical insights into the mechanisms of tensile creep of a Pd40Ni40P20 Bulk Metallic Glass — •Isabelle Binkowski1, Sergiy V. Divinski1,2, and Gerhard Wilde1,3 — 1Institute of Materials’ Physics, University of Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany — 2National University of Science and Technology "MISiS", Leninsky pr.4, Moscow, Russia — 3Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200072, China
Bulk metallic glasses (BMGs) are known for their high elastic limit, high yield strength, high hardness, corrosion resistance and soft magnetic properties. However, engineering requires a suitable amount of deformability, which, in the case of bulk metallic glasses, is lacking. At sufficiently low temperatures (below Tg) or at high strain rates, deformation of BMGs proceeds inhomogeneously via the formation of thin 2D-like regions of localized strain, so-called shear bands, whose continued activation lead to a catastrophic failure.
For fundamental investigations of properties and mechanisms of shear banding, a Pd40Ni40P20 BMG is used, due to its high thermal stability against crystallization in a wide temperature range. A set of miniaturized tensile creep tests is performed at constant stress conditions to give further insights into the shear band events and shear band interactions. The tests are performed in the temperature range between 413 K to 443 K and the stress is fixed at 900 MPa which is about 60% of the yield stress.
A financial support of DFG via SPP 1594 is acknowledged.