Nanomechanics and Small-Scale Plasticity

Themenbereich:
Modellierung & Simulation

 

Verantwortlicher Mitarbeiter:

Prof. Dr.-Ing. Erik Bitzek (Privatdozent)
Aviral Vaid
Zhuocheng Xie


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 [2014],
Reversible cyclic deformation mechanism of gold nanowires by twinning–detwinning
transition evidenced from in situ TEM, Nat. Commun. 5 3033 Link 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.

We are part of the international CNRS research network MECANO focused on the “Mechanics of Nano-objects”, and the Graduate Research School GRK1896.

The movie shows the deformation mechanisms during bending and subsequent load removal of a [110] oriented Cu Nanowire.

Related Publications:

  • S. Lee, A. Vaid, J. Im, B. Kim, A. Prakash, J. Guénolé, D. Kiener, E. Bitzek & S. H. Oh [2020], „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 [2020], „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 [2019], „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 [2018], „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 [2016], 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 [2015], Influence of anisotropic elasticity on the mechanical properties of fivefold twinned nanowires, Journal of the Mechanics and Physics of Solids 84 358 Link to paper
  • T. Klöffel, E. Bitzek, B. Meyer [2015], Impact of twin boundaries on bulk elastic constants, Data in Brief 3 209 Link to paper
  • A. Köbler, T. Beuth, T. Klöffel, R. Prang, M. Moosmann, T. Scherer, S. Walheim, H. Hahn, C. Kübel, B. Meyer, T. Schimmel, E. Bitzek [2015], Nanotwinned silver nanowires: Structure and mechanical properties, Acta Mater. 92 299 Link to paper
    This paper is also among the 25 hottest papers of the journal for the period April-June 2015.
  • J. Amodeo, C. Begau, E. Bitzek [2014], Atomistic Simulations of Compression Tests on Ni3Al Nanocubes, Mater. Res. Lett. 2 140 Link to paper
  • F. Niekiel, E. Bitzek, E. Spiecker [2014], Combining Atomistic Simulation and X-ray Diffraction for the Characterization of Nanostructures: A Case Study on Fivefold Twinned Nanowires, ACS Nano 8, 1629-1638 Link to article
  • S. Lee, J. Im, Y. Yoo, E. Bitzek, D. Kiener, G. Richter, B. Kim, S. H. Oh [2014], Reversible cyclic deformation mechanism of gold nanowires by twinning–detwinning transition evidenced from in situ TEM, Nat. Commun. 5 3033 Link to paper
  • A. Sedlmayr, E. Bitzek, D.S. Gianola, G. Richter, R. Mönig, O. Kraft, [2012], Existence of two twinning-mediated plastic deformation modes in Au nanowhiskers, Acta Mater. 60 3985 Link to paper
  • E. Bitzek [2012], Atomistic Study of Twinning in Gold Nanowhiskers, Journal of Solid Mechanics and Materials Engineering 6 99 Link to paper