Mapping and Assessing Plastic Deformation Using EBSD

Brewer, Luke N.; Field, David P.; Merriman, C.C.

doi:10.1007/978-0-387-88136-2_18

Cited by 101 publications

(36 citation statements)

References 27 publications

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“…[15], the local average misorientation angle is directly related to the geometrically necessary dislocation content (i.e. retained dislocations after recovery).…”

Section: Analysis and Discussionmentioning

confidence: 99%

Characterization of etch pits found on a large-grain bulk niobium superconducting radio-frequency resonant cavity

Zhao

Ciovati

Bieler

2010

Phys. Rev. ST Accel. Beams

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The performance of superconducting radio-frequency (SRF) resonant cavities made of bulk niobium is limited by nonlinear localized effects. Surface analysis of regions of higher power dissipation is thus of intense interest. Such areas (referred to as ''hotspots'') were identified in a large-grain single-cell cavity that had been buffered-chemical polished and dissected for examination by high resolution electron microscopy, electron backscattered diffraction microscopy (EBSD), and optical microscopy. Pits with clearly discernible crystal facets were observed in both ''hotspot'' and ''coldspot'' specimens. The pits were found in-grain, at bicrystal boundaries, and on tricrystal junctions. They are interpreted as etch pits induced by crystal defects (e.g. dislocations). All coldspots examined had a qualitatively lower density of etch pits or relatively smooth tricrystal boundary junctions. EBSD mapping revealed the crystal orientation surrounding the pits. Locations with high pit density are correlated with higher mean values of the local average misorientation angle distributions, indicating a higher geometrically necessary dislocation content. In addition, a survey of the samples by energy dispersive x-ray analysis did not show any significant contamination of the samples' surface. The local magnetic field enhancement produced by the sharp-edge features observed on the samples is not sufficient to explain the observed degradation of the cavity quality factor, which starts at peak surface magnetic field as low as 20 mT.

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“…[15], the local average misorientation angle is directly related to the geometrically necessary dislocation content (i.e. retained dislocations after recovery).…”

Section: Analysis and Discussionmentioning

confidence: 99%

Characterization of etch pits found on a large-grain bulk niobium superconducting radio-frequency resonant cavity

Zhao

Ciovati

Bieler

2010

Phys. Rev. ST Accel. Beams

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“…It is noted that previous studies have tended to correlate the dependence of the intragranular local misorientation on grain orientation to the Taylor factor; such that grains with larger Taylor factor values possess a higher density of geometrically necessary dislocations [40,50]. However, such correlations ignore: (i) the inability of the Taylor model to account for deformation inhomogeneities and, (ii) that the Taylor factor is only a measure of a material's current state without considering its prior deformation history [54].…”

Section: The Dependence Of the Intragranular Local Misorientation On mentioning

confidence: 99%

Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension

2013

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. (2013). Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension. Acta Materialia, 61 (7), 2671-2691.Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension AbstractA combination of electron back-scattering diffraction and X-ray diffraction was used to track the evolution of the microstructure and texture of a fully recrystallized Fe-24 Mn-3 Al-2 Si-1 Ni-0.06 C twinning-inducedplasticity steel during interrupted uniaxial tensile testing. Texture measurements returned the characteristic double fibre texture for face-centred cubic materials, with a relatively stronger 〈1 1 1〉 and a weaker 〈1 0 0〉 partial fibre parallel to the tensile axis. The interaction with the stable 〈1 1 1〉 oriented grains results in preferential plastic flow in the unstable 〈1 1 0〉 oriented grains. Consequently, the grains oriented along the 〈1 1 0〉 and 〈1 0 0〉 fibres record the highest and lowest values of intragranular local misorientation, respectively. The viscoplastic self-consistent model was used to simulate the macroscopic stress-strain response as well as track the evolution of bulk crystallographic texture by detailing the contributions of perfect and/or partial slip, twinning and latent hardening. The simulations revealed the dominant role of perfect slip and the limited volume effect of twinning on the texture development. The effects of initial orientation and grain interaction on the overall orientation stability during uniaxial tension showed that while the 〈1 0 0〉 fibre remains stable and does not affect the unstable orientations along the 〈1 1 0〉 fibre, the orientations along the stable 〈1 1 1〉 fibre strongly affect the unstable 〈1 1 0〉 orientations. on the overall orientation stability during uniaxial tension showed that while the 100  fibre remains stable and does not affect the unstable orientations along the 110  fibre, the orientations along the stable 111  fibre strongly affect the unstable 110  orientations.

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“…To measure recrystallization kinetics, electron back scatter diffraction was performed on each polished sample and the grain orientation spread (GOS) [4] was determined over a 1mm square region at the center of the section. This method measures local orientation spread by calculating the average misorientation within a grain with respect to the average orientation of the grain.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Aluminum Concentration on Static Recrystallization in Alpha Titanium Alloys

Trump¹,

Allison²

2016

Proceedings of the 13th World Conference on Titanium

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Mapping and Assessing Plastic Deformation Using EBSD

Cited by 101 publications

References 27 publications

Characterization of etch pits found on a large-grain bulk niobium superconducting radio-frequency resonant cavity

Characterization of etch pits found on a large-grain bulk niobium superconducting radio-frequency resonant cavity

Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension

The Influence of Aluminum Concentration on Static Recrystallization in Alpha Titanium Alloys

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