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Micromechanical testing techniques can reveal a variety of characteristics in materials that are otherwise impossible to address. However, unlike to macroscopic testing, these miniaturized experiments are more challenging to realize and analyze, as loading and boundary conditions can often not be controlled to the same extent as in standardized macroscopic tests. Hence, exploiting all possible information from such an experiment seems utmost desirable. In the present work, we utilize dynamic in situ microtensile testing of a nanocrystalline equiatomic CoCrFeMnNi high entropy alloy in conjunction with initial feature tracking to obtain a continuous two-dimensional strain field. This enables an evaluation of true stress–strain data as well as of the Poisson’s ratio and allows to study localization of plastic deformation for the specimen. We demonstrate that the presented image correlation method allows for an additional gain of information in these sophisticated experiments over commercial tools and can serve as a starting point to study deformation states exhibiting more complex strain fields. Graphic abstract: [Figure not available: see fulltext.].

Seiten (von - bis)2291-2304
FachzeitschriftJournal of materials research (JMR)
Frühes Online-Datum19 Jan. 2021
PublikationsstatusVeröffentlicht - 14 Juni 2021

Bibliographische Notiz

Funding Information:
The authors gratefully acknowledge the financial support under the scope of the COMET program within the K2 Center “Integrated Computational Material, Process and Product Engineering, IC-MPPE” (Project 859480, A2.12). This program is supported by the Austrian Federal Ministries for Transport, Innovation and Technology (BMVIT) and for Digital and Economic Affairs (BMDW), represented by the Österreichische Forschungsförderungsgesellschaft (Funder ID: 10.13039/501100004955), and the federal states of Styria, Upper Austria, and Tyrol. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant No. 771146 TOUGHIT). The authors would also like to thank Thomas Antretter and Stefan Kolitsch for fruitful discussion about finite strain theory as well as Easo P. George for providing the material necessary to perform this study.

Publisher Copyright:
© 2021, The Author(s).

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