Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 53: Liquid and Amorphous Metals

MM 53.3: Talk

Thursday, March 15, 2018, 10:45–11:00, TC 010

Metallic nanoglasses from nanoparticle consolidation: A computational study — •Omar Adjaoud and Karsten Albe — Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Materialmodellierung, Otto-Berndt-Str. 3, D-64287 Darmstadt, Germany

Metallic nanoglassses are amorphous materials with an inhomogeneous microstructure, which can be produced by consolidating nanometer-sized glassy spheres and consist of glassy grains connected by glass-glass interfaces. Experiments [1,2] and simulations [3,4] have revealed that glass-glass interfaces are chemically and topologically different from the grain intererior, but the influence of the consolidation process on the microstructure is still under debate. In this contribution, we present molecular dynamics simulations of the consolidation process of nanometer-sized metallic glassy spheres. Our results reveal that during cold compaction most of the glassy spheres deform by homogeneous plastic flow, while in some glassy spheres strain localization occurs. For all studied materials, the porosity is typically closed if the hydrostatic pressure exceeds 4 GPa. Structural analysis shows that the width of the resulting interfaces is significantly larger than in atomistic models based on planar interfaces. Moreover, structural changes occur not only in the interfaces but also in the glassy regions.

1. J. Jing et al., J. Non-Cryst. Solids 113, 167-170 (1989). 2. J.X. Fang et al., Nano Lett. 12, 458-463 (2012) . 3. Y. Ritter et al., Acta Mat. 59, 6588-6593 (2011) . 4. O. Adjaoud et al., Acta Mat. 113, 284-292 (2016).