Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 13: Liquid and Amorphous Metals III: Mechanical properties
MM 13.6: Vortrag
Montag, 7. März 2016, 17:15–17:30, H52
Shear band diffusion in cold rolled Pd40Ni40P20 bulk metallic glass micro-alloyed with Co — •Mikhail Seleznev1,2, Isabelle Binkowski1, Sergiy Divinskiy1, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Münster, Germany — 2Togliatty State University, Togliatty, Russia
Bulk metallic glasses (BMGs) appear to be promising materials due to a unique combination of glass-like elastic limit, hardness, corrosion resistance but without a ceramic-like brittleness. Although BMGs show some plasticity, their application is hindered due to deformation localization in shear bands (SBs). The shear banding mechanism seems to be the main reason for early failure in deformation and a key parameter that governs plasticity of BMGs.
Micro-alloying of the master alloy Pd40Ni40P20 glass with Co (1 at.%) was found to increase the plasticity during compression by 13% [1]. This strong enhancement was accompanied by significant branching of SBs which could be due to a change in the work softening process and also by an increase of the free volume. To clarify a possible correlation between the micro alloying-induced plasticity increase and the SB structure changes, the atomic diffusivity was measured in deformed samples by the radiotracer technique and the results are discussed in relation to the Co-free PdNiP glass.
A financial support of DFG via SPP 1594 and DAAD together with the Ministry of Education and Science of the Russian Federation (project 3723) is acknowledged.
1. Nollmann N. et al. Scr. Mater. 111, 119 (2015)