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Statistical confrontation between in-situ Electron Channeling Contrast Imaging and mesoscale polycrystal plasticity models.

Abstract : In the aim of following the fast evolution of the industrial demands, developing innovative techniques that allow to understand and to predict the mechanical properties of materials has become a necessity for the Materials Science community. For instance, mechanical tests combined with microstructural investigations provide engineers with the necessary information to computationally predict the mechanical performance of components. Such experiments allow capturing footprints of the deformation mechanisms responsible for the changing microstructure [1,2]. The Transmission Electron Microscope (TEM) is one of the most well-known techniques for observing and characterizing dislocations in electron transparent thin foils (thickness of ≈ 100 nm with a useful field of view of few µm²) [3,4,5]. Comprehensive dislocation studies at microscopic scale bring valuable information for extrapolating to the macroscopic mechanical response of materials and they can feed numerical advanced multiscale crystal plasticity models [6]. However, fundamental questions on the representativeness of observed phenomenon must be raised when extrapolating discussions to a millimeter-size specimen. In this framework, we have successfully combined macroscopic mechanical testing of bulk specimens with a dislocation-scale characterization technique: Accurate Electron Channeling Contrast Imaging (A-ECCI). A-ECCI is a non-destructive procedure offering the ability to provide, inside a Scanning Electron Microscope (SEM), TEM-like diffraction contrast imaging of sub-surface defects (at a depth of about 100 nm) on centimetric bulk specimen with still unsurpassed resolutions [7,8]. First, fundamentals on the defect contrasts and the experiment procedure will be presented [9,10]. Second, the full potentiality of A-ECCI for following the evolution of deformation microstructures will be highlighted [11,12]. As a first application, model predictions of the activated slip systems at the onset of plasticity during a uniaxial tensile test on a polycrystalline BCC titanium alloy are statistically confronted with A-ECCI analysis. Inspection of the resolved shear stress predicted by various mean-field and full-field models shows that using a full-field model with anisotropic elasticity provides a reasonable match [13]. References [1] – A. Guitton, S. Van Petegem, C. Tromas, A. Joulain, H. Van Swygenhoven, L. Thilly, App. Phys. Lett. 24, (2014). [2] – S. Van Petegem, A. Guitton, M. Dupraz, A. Bollhalder, K. Sofinowski, M.V. Upadhyay, H. Van Swygenhoven, L. Thilly, Exp. Mecha. 57, (2017). [3] – G.P. Bei, A. Guitton, A. Joulain, V. Brunet, S. Dubois, L. Thilly, C. Tromas, Philos. Mag. 93, (2013). [4] – A. Guitton, A. Joulain, L. Thilly, C. Tromas, Philos. Mag. 92, (2012). [5] – A. Guitton, A. Joulain, L. Thilly, C. Tromas, Sci. Rep. 4, (2014). [6] – K. Gourriet, P. Carrez, P. Cordier, A. Guitton, A. Joulain, L. Thilly, C. Tromas, Philos. Mag. 95, (2015). [7] – H. Mansour, J. Guyon, M.A. Crimp, N. Gey, B. Beausir, N. Maloufi, Scripta. Mater. 84-85, (2014). [8] – J. Guyon, H. Mansour, N. Gey, M.A. Crimp, S. Chalal, N. Maloufi, Ultramicroscopy 149, (2015). [9] – H. Kriaa, A. Guitton, N. Maloufi, Sci. Rep. 7, (2017). [10] – H. Kriaa, A. Guitton, N. Maloufi, Materials 12, (2019). [11] – A. Guitton, H. Kriaa, N. Maloufi, Materials 11, (2018). [12] – M. Ben Haj Slama, N. Maloufi, J. Guyon, S. Bahi, L. Weiss, A. Guitton, Materials 12, (2019). [13] – M. Ben Haj Slama, V. Taupin, N. Maloufi, K. Venkatraman, A.D. Rollett, R.A. Lebensohn, S. Berbenni, B. Beausir, A. Guitton, Materialia, 100996 (2020).
Keywords : Dislocation ECCI SEM
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https://hal.univ-lorraine.fr/hal-03042882
Contributor : Antoine Guitton <>
Submitted on : Monday, December 7, 2020 - 8:43:54 AM
Last modification on : Wednesday, March 10, 2021 - 6:54:06 PM

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  • HAL Id : hal-03042882, version 1

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Antoine Guitton. Statistical confrontation between in-situ Electron Channeling Contrast Imaging and mesoscale polycrystal plasticity models.. 4th Schöntal Symposium, 2020, Schöntal, Germany. ⟨hal-03042882⟩

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