Data-Mining of In-Situ TEM Experiments: On the Dynamics of Dislocations in CoCrFeMnNi Alloys

Zhang, Chen; Song, Hengxu; Oliveros, Daniela; Frączkiewicz, A.; Legros, Marc; Sandfeld, Stefan

doi:10.2139/ssrn.4102468

Cited by 1 publication

(1 citation statement)

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“…Furthermore, systematic data mining with tailored analysis methods will help to create statistically relevant data sets, and thereby allows to identify patterns, trends and correlations, and helps to remove any human bias while preserving the important domain knowledge. First steps into such a direction can be seen, e.g., in [41]. Additionally, such reconstructed 3D dislocation microstructures could, in the future, be used as input or for direct validation of, e.g., discrete dislocation dynamics simulations or even of molecular dynamics simulations.…”

Section: Discussionmentioning

confidence: 99%

Data-Mining of In-Situ TEM Experiments: Towards Understanding Nanoscale Fracture

Steinberger¹,

Issa²,

Strobl³

et al. 2022

Preprint

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The lifetime and performance of any engineering component, from nanoscale sensors to macroscopic structures, are strongly influenced by fracture processes. Fracture itself is a highly localized event; originating at the atomic scale by bond breaking between individual atoms close to the crack tip. These processes, however, interact with defects such as dislocations or grain boundaries and influence phenomena on much larger length scales, ultimately giving rise to macroscopic behavior and engineering-scale fracture properties. This complex interplay is the fundamental reason why identifying the atomistic structural and energetic processes occurring at a crack tip remains a longstanding and still unsolved challenge. We develop a completely new approach combining quantitative in situ observations of nanoscale deformation processes at a crack tip with three-dimensional reconstruction of the dislocation structure and advanced computational analysis to address fracture initiation in a ductile metal. Our combinatorial approach reveals details of dislocation nucleation, their interaction process, and the local internal stress state, all of which were previously inaccessible to experiments. This enables us to describe fracture processes based on local crack driving forces on a dislocation level, a previously unseen high fidelity that paves the way to better understand and control local failure processes in materials.

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Section: Discussionmentioning

confidence: 99%