Abstract
In this paper, thermomechanical couplings at the grain scale in metallic polycrystals are studied during the deformation process through an original experimental setup and improved calibration tools and full-field treatments. In order to perform intragranular thermomechanical analysis in a metallic polycrystal at the grain scale, a crystallography-based technique for the projection of the temperature and displacement fields on a polynomial basis is proposed. It enables intragranular coupled analysis of strain and temperature full-field data. Macroscopic, mesoscopic and granular analysis are then conducted and it is shown that the determination of a macroscopic yield stress as well as a critical resolved shear stress in grains is possible. Early local microplastic activity is therefore thermomechanically confirmed.
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Notes
HAGBs total length in the central area = 62.86 cm - Σ3 GBs length = 36.36 cm
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Acknowledgments
The authors would like to thank Patrick Villechaise at the Institut Pprime - UPR 3346 (ENSMA, Poitiers, France) for the EBSD analysis and fruitful discussions during this study.
The present research work has been supported by International Campus on Safety and Intermodality in Transportation (CISIT) the Nord-Pas-de-Calais Region, the European Community, the Ministry of Higher Education and Research, and the National Center for Scientific Research. The authors gratefully acknowledge the support of these institutions.
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Charkaluk, E., Seghir, R., Bodelot, L. et al. Microplasticity in Polycrystals: A Thermomechanical Experimental Perspective. Exp Mech 55, 741–752 (2015). https://doi.org/10.1007/s11340-014-9921-z
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DOI: https://doi.org/10.1007/s11340-014-9921-z