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"1 . Issue 6 (11th May 2017)

• Record Type: Journal Article
• Authors: Britton, Thomas Benjamin
• Is Part Of: Advanced engineering materials. Volume 19:Issue 6(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-05-11
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201700051
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : 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. Abstract : 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.