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Evaluation of grain-average stress tensor in a tensile-deformed Al–Mn polycrystal by high-energy X-ray diffraction

Abstract : Three-dimensional X-ray diffraction was applied to characterize the strain/stress evolution in individual grains of an Al-0.3 wt% Mn polycrystal deformed in situ at a synchrotron source. Methodological aspects concerning the calibration of the geometrical setup and the evaluation of the strain/stress tensors are discussed. A two-step calibration method separately treating the detector and the rotation axis allows one to determine the centre-of-mass position and crystallographic orientation of grains with standard errors of about 1.5 mm and 0.02 degrees, respectively. Numerical simulations indicate that the error of normal strain components (about 1 x 10(-4)) is mainly caused by calibration errors, while the error of shear components (about 0.5 x 10(-4)) is largely influenced by counting statistics and random spot-centre errors due to detector distortion. The importance of monitoring the beam energy is emphasized.
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https://hal-emse.ccsd.cnrs.fr/emse-01592654
Contributor : Géraldine Fournier-Moulin <>
Submitted on : Monday, September 25, 2017 - 11:32:07 AM
Last modification on : Wednesday, June 24, 2020 - 4:19:25 PM

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Loïc Renversade, András Borbély. Evaluation of grain-average stress tensor in a tensile-deformed Al–Mn polycrystal by high-energy X-ray diffraction. Journal of Applied Crystallography, International Union of Crystallography, 2017, 50 (Part. 4), pp.1144 - 1157. ⟨10.1107/S1600576717008238⟩. ⟨emse-01592654⟩

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