Microscale characterization of granular deformation near a crack tip

Jin, H.; Lu, Wei‐Yang; Haldar, Sandip; Bruck, Hugh A.

doi:10.1007/s10853-011-5608-3

Cited by 29 publications

(19 citation statements)

References 19 publications

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“…A natural idea is to combine EBSD and BSE images to give a description of the microstructure with the accuracy of crystal orientation 255 of EBSD image and spatial coordinates of BSE images. Manual matching of EBSD and SEM images has been performed in previous works [22], without stating the accuracy of the registration. The matching has also been performed by calculating a transformation matrix F from several markers visible in EBSD and SEM images [8].…”

Section: Registration Of Ebsd and Bse Imagesmentioning

confidence: 99%

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On the use of SEM correlative tools for in situ mechanical tests

et al. 2018

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In situ SEM mechanical tests are key to study crystal plasticity. In particular, imaging and diffraction (EBSD) allow microstructure and surface kinematics to be monitored all along the test. However, to get a full benefit from different modalities, it is necessary to register all images and crystallographic orientation maps from EBSD into the same frame. Different correlative approaches tracking either Pt surface markings, crystal orientations or grain boundaries, allow such registrations to be performed and displacement as well as rotation fields to be measured, a primary information for crystal plasticity identification. However, the different contrasts that are captured in different modalities and unavoidable stage motions also give rise to artifacts that are to be corrected to register the different information onto the same material points. The same image correlation tools reveal very powerful to correct such artifacts. Illustrated by an in situ uniaxial tensile test performed on a bainitic-ferritic steel sample, recent advances in image correlation techniques are reviewed and shown to provide a comprehensive picture of local strain and rotation maps.

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Section: Registration Of Ebsd and Bse Imagesmentioning

confidence: 99%

“…More recently, it was shown that crystal rotation fields can also be measured on surfaces by registering EBSD images via so-called quaternion correlation [5]. EBSD images have been overlaid manually on DIC strain map to study the relation between the texture and fatigue properties [22].…”

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confidence: 99%

On the use of SEM correlative tools for in situ mechanical tests

et al. 2018

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“…Crystal plasticity simulations based upon either molecular dynamics or finite elements are currently being developed to address these microstructuralinfluenced phenomena [3,4] and localization of plasticity along slip bands or persistent slip bands [5]. Experimental data on strain localization via in situ SEM DIC is available [6][7][8][9][10][11][12][13][14] at the microscale, however few experiments [15][16][17] have resolved subgrain strain fields at the scale of the localization of plasticity (slip bands).…”

Section: Introductionmentioning

confidence: 99%

Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

et al. 2015

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Damage during loading of polycrystalline metallic alloys is localized at or below the scale of individual grains. Quantitative assessment of the heterogeneous strain fields at the grain scale is necessary to understand the relationship between microstructure and elastic and plastic deformation. In the present study, digital image correlation (DIC) is used to measure the strains at the sub-grain level in a polycrystalline nickel-base superalloy where plasticity is localized into physical slip bands. Parameters to minimize noise given a set speckle pattern (introduced by chemical etching) when performing DIC in a scanning electron microscope (SEM) were adapted for measurements in both plastic and elastic regimes. A methodology for the optimization of the SEM and DIC parameters necessary for the minimization of the variability in strain measurements at high spatial resolutions is presented. The implications for detecting the early stages of damage development are discussed.

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“…Digital image correlation (DIC) is a technique that provides full field displacement information on the surface of a sample [26]. In doing so it is possible to calculate the localised strain field of a deforming material under mechanical loading [27].…”

Section: Introductionmentioning

confidence: 99%