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Comment on “An Experimental Study on Evolution of Grain‐Scale Stress/Strain and Geometrical Necessary Dislocations in Advanced TA15 Titanium Alloy during Uniaxial Tension Deformation”
Author(s) -
Britton Thomas Benjamin
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700051
Subject(s) - electron backscatter diffraction , materials science , titanium alloy , uniaxial tension , stress field , deformation (meteorology) , lattice (music) , diffraction , rotation (mathematics) , condensed matter physics , alloy , composite material , geometry , optics , physics , finite element method , microstructure , thermodynamics , mathematics , acoustics , ultimate tensile strength
This is a brief comment to highlight and discuss issues with regards to the high resolution, cross correlation‐based, electron backscatter diffraction (HR‐EBSD) results presented within the work of He et al. (2016) Advanced Engineering Materials. In this comment, two specific concerns are raised: one, the stress measurements, reported to be as high as 20 GPa, are unreasonable and due to a known artefact in the form of HR‐EBSD analysis, which has been corrected in state‐of‐the‐art measurements by patterning remapping; and two, the GND field measurements are incorrectly calculated and show the variations in lattice rotation and are no derived from the gradient of the lattice rotation field, as required when following Nye's analysis. An example of reasonable data is presented to highlight how these artefacts can be avoided in practice using more appropriate analysis techniques.