Dislocations nucleated during the compression of a <110> oriented Au nanowire, from S. Lee, J. Im, Y. Yoo, E. Bitzek, D. Kiener, G. Richter, B. Kim, S. H. Oh , Reversible cyclic deformation mechanism of gold nanowires by twinning–detwinning transition evidenced from in situ TEM, Nat. Commun. 5 3033Link to paper
The mechanical properties of metal structures change dramatically when their characteristic length scale is of the order of micrometers of below. Nanosized metallic wires, pillars, particles or thin films show for example an increased yield stress (the so-called “smaller is stronger” effect), and changes in their elastic response compared to their bulk counterparts.
In this project we use atomistic simulations to study the fundamental deformation mechanisms of metallic nanostructures. The results are directly used to interpret the experiments performed at our institute.
The movie shows the deformation mechanisms during bending and subsequent load removal of a  oriented Cu Nanowire.
S. Lee, A. Vaid, J. Im, B. Kim, A. Prakash, J. Guénolé, D. Kiener, E. Bitzek & S. H. Oh , "In-situ observation of the initiation of plasticity by nucleation of prismatic dislocation loops", Nat. Commun. 11, 2367, Link to paper
Z. Xie, J. Shin, J. Renner, A. Prakash, D. S. Gianola, E. Bitzek , "Origins of strengthening and failure in twinned Au nanowires: Insights from in− situ experiments and atomistic simulations", Acta Mater. 187, 166-175, Link to paper
E.I. Preiß, H. Lyu, J.P. Liebig, G. Richter, F. Gannott, P.A. Gruber, M. Göken, E. Bitzek, B. Merle , "Microstructural dependence of the fracture toughness of metallic thin films: A bulge test and atomistic simulation study on single-crystalline and polycrystalline silver films", Jour. Mater. Res. 34, 3483-3494, Link to paper
F. Houllé, F. Walsh, A. Prakash, E. Bitzek , "Atomistic Simulations of Compression Tests on γ-Precipitate Containing Ni3Al Nanocubes", Metallurgical and Materials Transactions A 49 4158–4166 Link to paper
W.G Nöhring, J.J Möller, Z. Xie, E. Bitzek , Wedge-shaped twins and pseudoelasticity in fcc metallic nanowires under bending, Extreme Mechanics Letters 8 140-150 Link to paper
F. Niekiel, E. Spiecker, E. Bitzek , Influence of anisotropic elasticity on the mechanical properties of fivefold twinned nanowires, Journal of the Mechanics and Physics of Solids 84 358Link to paper
T. Klöffel, E. Bitzek, B. Meyer , Impact of twin boundaries on bulk elastic constants, Data in Brief 3 209Link to paper
J. Amodeo, C. Begau, E. Bitzek , Atomistic Simulations of Compression Tests on Ni3Al Nanocubes, Mater. Res. Lett. 2 140 Link to paper
F. Niekiel, E. Bitzek, E. Spiecker , Combining Atomistic Simulation and X-ray Diffraction for the Characterization of Nanostructures: A Case Study on Fivefold Twinned Nanowires, ACS Nano 8, 1629-1638Link to article
S. Lee, J. Im, Y. Yoo, E. Bitzek, D. Kiener, G. Richter, B. Kim, S. H. Oh , Reversible cyclic deformation mechanism of gold nanowires by twinning–detwinning transition evidenced from in situ TEM, Nat. Commun. 5 3033Link to paper
A. Sedlmayr, E. Bitzek, D.S. Gianola, G. Richter, R. Mönig, O. Kraft, , Existence of two twinning-mediated plastic deformation modes in Au nanowhiskers, Acta Mater. 60 3985 Link to paper
E. Bitzek , Atomistic Study of Twinning in Gold Nanowhiskers, Journal of Solid Mechanics and Materials Engineering 6 99Link to paper