Anomalous Compliance and Early Yielding of Nanoporous Gold
By Bao-Nam Dinh Ngô, Alexander Stukowski, N. Mameka, J. Markmann, K. Albe, J. Weissmuller. 2015
136 citations recorded by the source corpus.
We present a study of the elastic and plastic behavior of nanoporous gold in compression, focusing on molecular dynamics simulation and inspecting experimental data for verification. Both approaches agree on an anomalously high elastic compliance in the early stages of deformation, along with a quasi immediate onset of plastic yielding even at the smallest load. Already before the first loading, the material undergoes spontaneous plastic deformation under the action of the capillary forces, requiring no external load. Plastic deformation under compressive load is accompanied by dislocation storage and dislocation interaction, along with strong strain hardening. Dislocation-starvation scenarios are not supported by our results. The stiffness increases during deformation, but never approaches the prediction by the relevant Gibson–Ashby scaling law. Microstructural disorder affects the plastic deformation behavior and surface excess elasticity might modify elastic response, yet we relate the anomalous compliance and the immediate yield onset to an atomistic origin: the large surface-induced prestress induces elastic shear that brings some regions in the material close to the shear instability of the generalized stacking fault energy curve. These regions are elastically highly compliant and plastically weak.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/c8e181ca0f876173dc024086ebb54c965a04d1c0
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In Materials Chemistry
- J. Weissmuller
- J. Markmann
- N. Mameka
- Celal Soyarslan
- Swantje Bargmann
- E. Lilleodden
- Ke Wang
- Marc Pradas
Citations in the corpus
- 3D stochastic bicontinuous microstructures: generation, topology and elasticity (2018, methodology): “With attention to modeling dealloyingmade metal network structures, several studies have used the simulation of spinodal decomposition via phase-field [54e56] or kinetic lattice Monte Carlo approaches [19,57].”
- Nanoporous Gold—Testing Macro-scale Samples to Probe Small-scale Mechanical Behavior (2016, methodology): “In situ observations of the effective elastic response during potential cycles on NPG-based hybrid materials explore the impact of the local elastic behavior at the surface for the effective stiffness of NPG.”