53 citations · 108 across the 8 of their papers we have counts for
9 papers
Data-mining of In-Situ TEM Experiments: on the Dynamics of Dislocations in CoCrFeMnNi Alloys
Chen Zhang, Hengxu Song, Daniela Oliveros +3
High entropy alloys are a class of materials with many significant improvements in terms of mechanical properties as compared to ``classical'' alloys. The corresponding structure-p…
Orientation-related twinning and dislocation glide in a Cantor High Entropy Alloy at room and cryogenic temperature studied by in situ TEM straining
Daniela Oliveros, Anna Fraczkiewicz, Antonin Dlouhy +4
In situ straining experiments were performed in a TEM on an equimolar CoCrFeMnNi (Cantor) high entropy alloy at room and cryogenic temperature. Perfect and partial dislocation acti…
Data-mining of dislocation microstructures: concepts for coarse-graining of internal energies
Hengxu Song, Nina Gunkelmann, Giacomo Po +1
Continuum models of dislocation plasticity require constitutive closure assumptions, e.g., by relating details of the dislocation microstructure to energy densities. Currently, the…
Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity
Jianqiao Hu, Hengxu Song, Zhanli Liu +3
Dislocations are the carriers of plasticity in crystalline materials. Their collective interaction behavior is dependent on the strain rate and sample size. In small specimens, det…
Multiscale study of the dynamic friction coefficient due to asperity plowing
jianqiao Hu, Hengxu Song, Stefan Sandfeld +2
A macroscopically nominal flat surface is rough at the nanoscale level and consists of nanoasperities. Therefore, the frictional properties of the macroscale-level rough surface ar…
The Universality Class of Nano-Crystal Plasticity: Self-Organization and Localization in Discrete Dislocation Dynamics
Hengxu Song, Dennis Dimiduk, Stefanos Papanikolaou
The universality class of the avalanche behavior in plastically deforming crystalline and amorphous systems has been commonly discussed, despite the fact that the microscopic defec…
Learning crystal plasticity using digital image correlation: Examples from discrete dislocation dynamics
Stefanos Papanikolaou, Michail Tzimas, Andrew C. E. Reid +1
Digital image correlation (DIC) is a well-established, non-invasive technique for tracking and quantifying the deformation of mechanical samples under strain. While it provides an…
Discrete Dislocation Dynamics Simulations of Nanoindentation with Pre-stress: Hardness and Statistics of Abrupt Plastic Events
Hengxu Song, Hakan Yavas, Erik Van der Giessen +1
The yield surface in crystal plasticity can be approached from various directions during mechanical loading. We consider the competition between nanoindentation and tensile loading…
Obstacles and sources in dislocation dynamics: Strengthening and statistics of abrupt plastic events in nanopillar compression
Stefanos Papanikolaou, Hengxu Song, Erik Van der Giessen
Mechanical deformation of nanopillars displays features that are distinctly different from the bulk behavior of single crystals: Yield strength increases with decreasing size and p…