Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 36: Liquid and Amorphous Metals

MM 36.10: Talk

Thursday, April 4, 2019, 12:45–13:00, H46

Atomic-scale deformation in metallic glass nanolaminates with shape memory alloys — •Daniel Şopu^1,2, Karsten Albe¹, and Jürgen Eckert^2,3 — ¹Technische Universität Darmstadt, Otto-Berndt-Straße 3, D-64287 Darmstadt, Germany — ²Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria — ³Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700, Leoben, Austria

Crystalline-metallic glass laminates with shape memory alloys represent a class of material with enhanced mechanical performance superior to those predicted from a simple rule-of-mixtures. Here, we model the deformation behavior of metallic amorphous Cu64Zr36/crystalline B2 CuZr nanolaminate systems using molecular-dynamics computer simulations. First, a modeling strategy is developed to capture the autocatalytic chain-type deformation mechanism. We find that the deformation of the glassy and crystalline phases is a coupled process: martensitic transformation leads to shear band formation while the stress at the shear band tip induces martensitic transformation in the shape memory crystal. Moreover, the martensitic transformation changes the shear band morphology, stabilizes the shear flow and avoids a runaway instability. Finally, we differentiate the contributions of the aspect ratio, laminate thickness, volume fraction and structural rejuvenation to the plasticity. Therefore, tailoring the architecture of metallic glass laminates with shape memory phases may allow the development of materials that exhibit large tensile ductility.