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.
Highlights
During the mechanical loading of metallic polycrystals, the diversity of grain orientations leads to inhomogeneous deformation and results in local plasticity
The first objective of this paper is to present the original tools developed for the study of thermomechanical couplings in polycrystals
To reach our goal of conducting cristallography-based investigations, we propose to use the complementary Electron Back-Scattered Diffraction (EBSD) field in order to project the initial measurements onto the microstructure [27]
Summary
During the mechanical loading of metallic polycrystals, the diversity of grain orientations leads to inhomogeneous deformation and results in local plasticity. L. Bodelot Laboratoire de Mecanique des Solides, CNRS UMR 7649, F-91128 Palaiseau, France have been studied and modeled for many decades and one can cite, for example, the pioneering works of [1, 2] and [3]. Bodelot Laboratoire de Mecanique des Solides, CNRS UMR 7649, F-91128 Palaiseau, France have been studied and modeled for many decades and one can cite, for example, the pioneering works of [1, 2] and [3] These observations are extensively described, synthesized and modeled in the Cottrell’s reference book [4]. During deformation, this local and global plasticity triggers a dissipation a temperature increase in the specimen, a phenomenon that was studied very early by Taylor and co-workers [8,9,10] using global calorimetric measurements. [11] proposed a temperature-based method for the determination of a yield stress which was defined at the transition between thermoelastic and thermoelastoplastic regimes
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