Measurement of geometrically necessary dislocation density with high resolution electron backscatter diffraction: Effects of detector binning and step size

Jiang, Jun; Britton, T. Ben

doi:10.1016/j.ultramic.2012.11.003

Cited by 234 publications

(143 citation statements)

References 33 publications

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“…The lowest GND density readily detected by conventional EBSD has been assessed by various authors (Adams and Kacher, 2010;Chekhonin et al, 2014;Field et al, 2012) and is step size dependent. In copper at a 0.5µm step size GND density below 10 14 m -2 cannot be determined using conventional EBSD (Adams and Kacher, 2010;Jiang et al, 2013b). Mishin et al (Mishin et al, 2009) suggested the emergence of HR-EBSD technique might provide promising deformation structure results for a much larger range of plastic deformation.…”

Section: Development Of High Resolution Electron Backscatter Diffractmentioning

confidence: 99%

“…This problem was overcome by designing a Matlab software script (http://www.mathworks.co.uk/) to transfer and store all EBSD images into a single HDF5 file (http://www.hdfgroup.org/) (Jackson et al, 2014;Jiang et al, 2013b). This allowed the ~16 frames per second rate to be maintained throughout the data acquisition process.…”

Section: Mechanical Test and Ebsdmentioning

confidence: 99%

“…To estimate the stored geometrically necessary dislocation (GND) density, the saved EBSD patterns were analysed using an image cross-correlation based software which had been developed in Matlab by the Authors Wilkinson, 2011, 2012;Jiang et al, 2013b;Karamched and Wilkinson, 2010;Wilkinson et al, 2006a;Wilkinson et al, 2006b;Wilkinson and Randman, 2010b). This crosscorrelation based method can improve the EBSD angular resolution to ~1x10 -4 rads or better (Wilkinson et al, 2006b).…”

Section: Hr-ebsd and Gnd Densitymentioning

confidence: 99%

“…This crosscorrelation based method can improve the EBSD angular resolution to ~1x10 -4 rads or better (Wilkinson et al, 2006b). Though at the 4x4 binning used for these observations the angular resolution is 5x10 -4 rads (Jiang et al, 2013b). The cross-correlation based EBSD technique is often referred as high resolution EBSD (HR-EBSD).…”

Section: Hr-ebsd and Gnd Densitymentioning

confidence: 99%

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The orientation and strain dependence of dislocation structure evolution in monotonically deformed polycrystalline copper

Jiang

Britton

Wilkinson

2015

International Journal of Plasticity

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Section: Development Of High Resolution Electron Backscatter Diffractmentioning

confidence: 99%

Section: Mechanical Test and Ebsdmentioning

confidence: 99%

Section: Hr-ebsd and Gnd Densitymentioning

confidence: 99%

Section: Hr-ebsd and Gnd Densitymentioning

confidence: 99%

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The orientation and strain dependence of dislocation structure evolution in monotonically deformed polycrystalline copper

Jiang

Britton

Wilkinson

2015

International Journal of Plasticity

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“…Subsequent analysis to calculate residual stress distributions and stored GND density was performed offline using the HR-EBSD analysis method described elsewhere [40][41][42][43][44]. Briefly, HR-EBSD involves direct pattern comparison of two or more diffraction patterns to determine the lattice rotation and residual elastic strain gradients between the crystals which are illuminated by the electron beam.…”

Section: Ebsd and Hr-ebsd Measurementmentioning

confidence: 99%

On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

et al. 2015

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This is an authors' copy of a manuscript published in Acta Materialia Volume 97, 15 September 2015, Pages 367-379. http://dx.doi.org/10.1016/j.actamat.2015.06.035 AbstractA series of interrupted three-point bend low-cycle fatigue tests were carried out on a powder metallurgy FHG96 nickel superalloy sample containing non-metallic inclusions. High resolution electron backscatter diffraction (HR-EBSD) was used to characterize the distribution and evolution of geometrically necessary dislocation (GND) density, residual stress and total dislocation density near a non-metallic inclusion. A systematic study of room temperature cyclic deformation is presented in which slip localisation, cyclic hardening, ratcheting and stabilisation occur, through to crack formation and microstructurally-sensitive propagation. Particular focus is brought to bear at the inclusion-matrix interface. Complex inhomogeneous deformation structures were directly observed from the first few loading cycles, and these structures were found not to vary significantly with increasing number of cycles. A clear link was observed between crack nucleation site and microstructurally-sensitive growth path and the spatially-resolved sites of extreme values of residual stress and GND density.

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Crystallographic Preferred Orientation of Olivine in Sheared Partially Molten Rocks: The Source of the “a‐c Switch”

Hansen

Wallis

et al. 2018

Geochem Geophys Geosyst

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To investigate the mechanism that produces the crystallographic preferred orientations (CPO) characteristic of sheared partially molten rocks of mantle composition, we analyzed the microstructures of samples of olivine plus 7% basaltic melt deformed in torsion to shear strains as large as γ= 13.3. Electron backscattered diffraction (EBSD) observations reveal a CPO characterized by a weak a‐c girdle in the shear plane that develops by γ≈ 4. This CPO, which exhibits a slightly stronger alignment of [001] than [100] axes in the shear direction, changes little in both strength and distribution with increasing stress and with increasing strain. Furthermore, it is significantly weaker than the CPO observed for dry, melt‐free olivine aggregates. Orientation maps correlated with grain shape measurements from tangential, radial, and transverse sections indicate that olivine grains are longer along [001] axes than along [100] axes and shortest along [010] axes. This morphology is similar to that of olivine grains in a mafic melt. We conclude that the weak a‐c girdle observed in sheared partially molten rocks reflects contributions from two processes. Due to their shape‐preferred orientation (SPO), grains rotate to align their [001] axes parallel to the flow direction. At the same time, dislocation glide on the (010)[100] slip system rotates [100] axes into the flow direction. The presence of this CPO in partially molten regions of the upper mantle significantly impacts the interpretation of seismic anisotropy and kinematics of flow.

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Measurement of geometrically necessary dislocation density with high resolution electron backscatter diffraction: Effects of detector binning and step size

Cited by 234 publications

References 33 publications

The orientation and strain dependence of dislocation structure evolution in monotonically deformed polycrystalline copper

The orientation and strain dependence of dislocation structure evolution in monotonically deformed polycrystalline copper

On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

Crystallographic Preferred Orientation of Olivine in Sheared Partially Molten Rocks: The Source of the “a‐c Switch”

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